text:
Chickenpox
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For other uses, see Chickenpox (disambiguation).
"Varicella" redirects here. For other uses, see Varicella (disambiguation).
Not to be confused with Fowlpox or Smallpox.
Chickenpox
Synonyms
Varicella
Person with chickenpox
Specialty
Infectious disease
Symptoms
Small, itchy blisters, headache, loss of appetite, tiredness[1]
Usual onset
10–21 days after exposure[2]
Duration
5–7 days[1]
Causes
Varicella zoster virus[3]
Prevention
Varicella vaccine[4]
Medication
Calamine lotion, paracetamol (acetaminophen), aciclovir[2]
Deaths
6,400 (with shingles)[5]
Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).[3] The disease results in a characteristic skin rash that forms small, itchy blisters, which eventually scab over.[1] It usually starts on the chest, back, and face then spreads to the rest of the body.[1] Other symptoms may include fever, tiredness, and headaches.[1] Symptoms usually last five to seven days.[1] Complications may occasionally include pneumonia, inflammation of the brain, and bacterial skin infections.[6] The disease is often more severe in adults than in children.[7] Symptoms begin 10 to 21 days after exposure to the virus.[2]
Chickenpox is an airborne disease which spreads easily through the coughs and sneezes of an infected person.[2] It may be spread from one to two days before the rash appears until all lesions have crusted over.[2] It may also spread through contact with the blisters.[2] Those with shingles may spread chickenpox to those who are not immune through contact with the blisters.[2] The disease can usually be diagnosed based on the presenting symptom;[8] however, in unusual cases it may be confirmed by polymerase chain reaction (PCR) testing of the blister fluid or scabs.[7] Testing for antibodies may be done to determine if a person is or is not immune.[7] People usually only get chickenpox once.[2] Although reinfections by the virus occur, these reinfections usually do not cause any symptoms.[9]
Since its introduction in 1995, the varicella vaccine has resulted in a decrease in the number of cases and complications from the disease.[4] It protects about 70 to 90 percent of people from disease with a greater benefit for severe disease.[7] Routine immunization of children is recommended in many countries.[10] Immunization within three days of exposure may improve outcomes in children.[11] Treatment of those infected may include calamine lotion to help with itching, keeping the fingernails short to decrease injury from scratching, and the use of paracetamol (acetaminophen) to help with fevers.[2] For those at increased risk of complications, antiviral medication such as aciclovir are recommended.[2]
Chickenpox occurs in all parts of the world.[7] In 2013 there were 140 million cases of chickenpox and herpes zoster worldwide.[12] Before routine immunization the number of cases occurring each year was similar to the number of people born.[7] Since immunization the number of infections in the United States has decreased nearly 90%.[7] In 2015 chickenpox resulted in 6,400 deaths globally – down from 8,900 in 1990.[5][13] Death occurs in about 1 per 60,000 cases.[7] Chickenpox was not separated from smallpox until the late 19th century.[7] In 1888 its connection to shingles was determined.[7] The first documented use of the term chicken pox was in 1658.[14] Various explanations have been suggested for the use of "chicken" in the name, one being the relative mildness of the disease.[14]
Contents
1 Signs and symptoms
1.1 Pregnancy and neonates
2 Pathophysiology
2.1 Shingles
3 Diagnosis
4 Prevention
4.1 Hygiene measures
4.2 Vaccine
5 Treatment
5.1 Children
5.2 Adults
6 Prognosis
7 Epidemiology
8 Etymology
9 Society and culture
10 Other animals
11 References
12 External links
Signs and symptoms[edit]
A single blister, typical during the early stages of the rash
The early (prodromal) symptoms in adolescents and adults are nausea, loss of appetite, aching muscles, and headache. This is followed by the characteristic rash or oral sores, malaise, and a low-grade fever that signal the presence of the disease. Oral manifestations of the disease (enanthem) not uncommonly may precede the external rash (exanthem). In children the illness is not usually preceded by prodromal symptoms, and the first sign is the rash or the spots in the oral cavity. The rash begins as small red dots on the face, scalp, torso, upper arms and legs; progressing over 10–12 hours to small bumps, blisters and pustules; followed by umbilication and the formation of scabs.[15][16]
At the blister stage, intense itching is usually present. Blisters may also occur on the palms, soles, and genital area. Commonly, visible evidence of the disease develops in the oral cavity and tonsil areas in the form of small ulcers which can be painful or itchy or both; this enanthem (internal rash) can precede the exanthem (external rash) by 1 to 3 days or can be concurrent. These symptoms of chickenpox appear 10 to 21 days after exposure to a contagious person. Adults may have a more widespread rash and longer fever, and they are more likely to experience complications, such as varicella pneumonia.[15]
Because watery nasal discharge containing live virus usually precedes both exanthem (external rash) and enanthem (oral ulcers) by 1 to 2 days, the infected person actually becomes contagious one to two days before recognition of the disease. Contagiousness persists until all vesicular lesions have become dry crusts (scabs), which usually entails four or five days, by which time nasal shedding of live virus ceases.[17] The condition usually resolves by itself within a couple of weeks.[18] The rash may, however, last for up to one month.[medical citation needed]
Chickenpox is rarely fatal, although it is generally more severe in adult men than in women or children. Non-immune pregnant women and those with a suppressed immune system are at highest risk of serious complications. Arterial ischemic stroke (AIS) associated with chickenpox in the previous year accounts for nearly one third of childhood AIS.[19] The most common late complication of chickenpox is shingles (herpes zoster), caused by reactivation of the varicella zoster virus decades after the initial, often childhood, chickenpox infection.
The back of a 30-year-old male after five days of the rash
A 3-year-old girl with a chickenpox rash on her torso
Lower leg of a child with chickenpox
A child with chickenpox
A child with chickenpox on her face.
Pregnancy and neonates[edit]
During pregnancy the dangers to the fetus associated with a primary VZV infection are greater in the first six months. In the third trimester, the mother is more likely to have severe symptoms.[20] For pregnant women, antibodies produced as a result of immunization or previous infection are transferred via the placenta to the fetus.[21] Varicella infection in pregnant women could lead to spread via the placenta and infection of the fetus. If infection occurs during the first 28 weeks of gestation, this can lead to fetal varicella syndrome (also known as congenital varicella syndrome).[22] Effects on the fetus can range in severity from underdeveloped toes and fingers to severe anal and bladder malformation. Possible problems include:
Damage to brain: encephalitis,[23] microcephaly, hydrocephaly,[24] aplasia of brain
Damage to the eye: optic stalk, optic cup, and lens vesicles, microphthalmia, cataracts, chorioretinitis, optic atrophy
Other neurological disorder: damage to cervical and lumbosacral spinal cord, motor/sensory deficits, absent deep tendon reflexes, anisocoria/Horner's syndrome
Damage to body: hypoplasia of upper/lower extremities, anal and bladder sphincter dysfunction
Skin disorders: (cicatricial) skin lesions, hypopigmentation
Infection late in gestation or immediately following birth is referred to as "neonatal varicella".[25] Maternal infection is associated with premature delivery. The risk of the baby developing the disease is greatest following exposure to infection in the period 7 days before delivery and up to 8 days following the birth. The baby may also be exposed to the virus via infectious siblings or other contacts, but this is of less concern if the mother is immune. Newborns who develop symptoms are at a high risk of pneumonia and other serious complications of the disease.[26]
Pathophysiology[edit]
Main article: Varicella zoster virus
Exposure to VZV in a healthy child initiates the production of host immunoglobulin G (IgG), immunoglobulin M (IgM), and immunoglobulin A (IgA) antibodies; IgG antibodies persist for life and confer immunity. Cell-mediated immune responses are also important in limiting the scope and the duration of primary varicella infection. After primary infection, VZV is hypothesized to spread from mucosal and epidermal lesions to local sensory nerves. VZV then remains latent in the dorsal ganglion cells of the sensory nerves. Reactivation of VZV results in the clinically distinct syndrome of herpes zoster (i.e., shingles), postherpetic neuralgia,[27] and sometimes Ramsay Hunt syndrome type II.[28] Varicella zoster can affect the arteries in the neck and head, producing stroke, either during childhood, or after a latency period of many years.[29]
Shingles[edit]
Main article: Herpes zoster
After a chickenpox infection, the virus remains dormant in the body's nerve tissues. The immune system keeps the virus at bay, but later in life, usually in an adult, it can be reactivated and cause a different form of the viral infection called shingles (also known as herpes zoster).[30] The United States Advisory Committee on Immunization Practices (ACIP) suggests that every adult over the age of 50 years get the herpes zoster vaccine.[31]
Shingles affects one in five adults infected with chickenpox as children, especially those who are immune-suppressed, particularly from cancer, HIV, or other conditions. Stress can bring on shingles as well, although scientists are still researching the connection.[32] Shingles are most commonly found in adults over the age of 60 who were diagnosed with chickenpox when they were under the age of 1.[33]
Diagnosis[edit]
Chickenpox.
The diagnosis of chickenpox is primarily based on the signs and symptoms, with typical early symptoms followed by a characteristic rash. Confirmation of the diagnosis is by examination of the fluid within the vesicles of the rash, or by testing blood for evidence of an acute immunologic response.
Vesicular fluid can be examined with a Tzanck smear, or by testing for direct fluorescent antibody. The fluid can also be "cultured", whereby attempts are made to grow the virus from a fluid sample. Blood tests can be used to identify a response to acute infection (IgM) or previous infection and subsequent immunity (IgG).[34]
Prenatal diagnosis of fetal varicella infection can be performed using ultrasound, though a delay of 5 weeks following primary maternal infection is advised. A PCR (DNA) test of the mother's amniotic fluid can also be performed, though the risk of spontaneous abortion due to the amniocentesis procedure is higher than the risk of the baby's developing fetal varicella syndrome.[26]
Prevention[edit]
Hygiene measures[edit]
The spread of chickenpox can be prevented by isolating affected individuals. Contagion is by exposure to respiratory droplets, or direct contact with lesions, within a period lasting from three days before the onset of the rash, to four days after the onset of the rash.[35] The chickenpox virus is susceptible to disinfectants, notably chlorine bleach (i.e., sodium hypochlorite). Like all enveloped viruses, it is sensitive to desiccation, heat and detergents.
Vaccine[edit]
Main article: Varicella vaccine
The varicella vaccine is recommended in many countries.[10] Some countries require the varicella vaccination or an exemption before entering elementary school. A second dose is recommended five years after the initial immunization.[36] A vaccinated person is likely to have a milder case of chickenpox if they become infected.[37] Immunization within three days following household contact reduces infection rates and severity in children.[11]
It is part of the routine immunization schedule in the US.[38] Some European countries include it as part of universal vaccinations in children,[39] but not all countries provide the vaccine due to its cost.[10] In the UK as of 2014, the vaccine is only recommended in people who are particularly vulnerable to chickenpox.[40] In populations that have not been immunized or if immunity is questionable, a clinician may order an enzyme immunoassay. An immunoassay measures the levels of antibodies against the virus that give immunity to a person. If the levels of antibodies are low (low titer) or questionable, reimmunization may be done.[41]
Treatment[edit]
Treatment mainly consists of easing the symptoms. As a protective measure, people are usually required to stay at home while they are infectious to avoid spreading the disease to others. Cutting the nails short or wearing gloves may prevent scratching and minimize the risk of secondary infections.
Although there have been no formal clinical studies evaluating the effectiveness of topical application of calamine lotion (a topical barrier preparation containing zinc oxide, and one of the most commonly used interventions), it has an excellent safety profile.[42] It is important to maintain good hygiene and daily cleaning of skin with warm water to avoid secondary bacterial infection.[43] Scratching may also increase the risk of secondary infection.[44]
Paracetamol (acetaminophen) but not aspirin may be used to reduce fever. Aspirin use by someone with chickenpox may cause the serious, sometimes fatal disease of the liver and brain, Reye syndrome. People at risk of developing severe complications who have had significant exposure to the virus may be given intra-muscular varicella zoster immune globulin (VZIG), a preparation containing high titres of antibodies to varicella zoster virus, to ward off the disease.[45][46]
Antivirals are sometimes used.[47][48]
Children[edit]
If aciclovir by mouth is started within 24 hours of rash onset, it decreases symptoms by one day but has no effect on complication rates.[49][50] Use of acyclovir therefore is not currently recommended for individuals with normal immune function. Children younger than 12 years old and older than one month are not meant to receive antiviral drugs unless they have another medical condition which puts them at risk of developing complications.[51]
Treatment of chickenpox in children is aimed at symptoms while the immune system deals with the virus. With children younger than 12 years, cutting nails and keeping them clean is an important part of treatment as they are more likely to scratch their blisters more deeply than adults.[52]
Aspirin is highly contraindicated in children younger than 16 years, as it has been related to Reye syndrome.[53]
Adults[edit]
Infection in otherwise healthy adults tends to be more severe.[54] Treatment with antiviral drugs (e.g. acyclovir or valacyclovir) is generally advised, as long as it is started within 24–48 hours from rash onset.[51] Remedies to ease the symptoms of chickenpox in adults are basically the same as those used for children. Adults are more often prescribed antiviral medication, as it is effective in reducing the severity of the condition and the likelihood of developing complications. Antiviral medicines do not kill the virus but stop it from multiplying. Adults are advised to increase water intake to reduce dehydration and to relieve headaches. Painkillers such as paracetamol (acetaminophen) are recommended, as they are effective in relieving itching and other symptoms such as fever or pains. Antihistamines relieve itching and may be used in cases where the itching prevents sleep, because they also act as a sedative. As with children, antiviral medication is considered more useful for those adults who are more prone to develop complications. These include pregnant women or people who have a weakened immune system.[55]
Sorivudine, a nucleoside analogue, has been reported to be effective in the treatment of primary varicella in healthy adults (case reports only), but large-scale clinical trials are still needed to demonstrate its efficacy.[56]
Prognosis[edit]
The duration of the visible blistering caused by varicella zoster virus varies in children usually from 4 to 7 days, and the appearance of new blisters begins to subside after the fifth day. Chickenpox infection is milder in young children, and symptomatic treatment, with sodium bicarbonate baths or antihistamine medication may ease itching. Paracetamol (acetaminophen) is widely used to reduce fever. Aspirin, or products containing aspirin, should not be given to children with chickenpox, as it can cause Reye's Syndrome.[57]
In adults, the disease is more severe,[58] though the incidence is much less common. Infection in adults is associated with greater morbidity and mortality due to pneumonia (either direct viral pneumonia or secondary bacterial pneumonia),[59] bronchitis (either viral bronchitis or secondary bacterial bronchitis),[59] hepatitis,[60] and encephalitis.[61] In particular, up to 10% of pregnant women with chickenpox develop pneumonia, the severity of which increases with onset later in gestation. In England and Wales, 75% of deaths due to chickenpox are in adults.[26] Inflammation of the brain, or encephalitis, can occur in immunocompromised individuals, although the risk is higher with herpes zoster.[62] Necrotizing fasciitis is also a rare complication.[63]
Varicella can be lethal to adults with impaired immunity. The number of people in this high-risk group has increased, due to the HIV epidemic and the increased use of immunosuppressive therapies.[64] Varicella is a particular problem in hospitals, when there are patients with immune systems weakened by drugs (e.g., high-dose steroids) or HIV.[65]
Secondary bacterial infection of skin lesions, manifesting as impetigo, cellulitis, and erysipelas, is the most common complication in healthy children. Disseminated primary varicella infection usually seen in the immunocompromised may have high morbidity. Ninety percent of cases of varicella pneumonia occur in the adult population. Rarer complications of disseminated chickenpox include myocarditis, hepatitis, and glomerulonephritis.[66]
Hemorrhagic complications are more common in the immunocompromised or immunosuppressed populations, although healthy children and adults have been affected. Five major clinical syndromes have been described: febrile purpura, malignant chickenpox with purpura, postinfectious purpura, purpura fulminans, and anaphylactoid purpura. These syndromes have variable courses, with febrile purpura being the most benign of the syndromes and having an uncomplicated outcome. In contrast, malignant chickenpox with purpura is a grave clinical condition that has a mortality rate of greater than 70%. The cause of these hemorrhagic chickenpox syndromes is not known.[66]
Epidemiology[edit]
Primary varicella occurs in all countries worldwide. In 2013 the disease resulted in 7,000 deaths – down from 8,900 in 1990.[13]
In temperate countries, chickenpox is primarily a disease of children, with most cases occurring during the winter and spring, most likely due to school contact. It is one of the classic diseases of childhood, with the highest prevalence in the 4–10-year-old age group. Like rubella, it is uncommon in preschool children. Varicella is highly communicable, with an infection rate of 90% in close contacts. In temperate countries, most people become infected before adulthood, and 10% of young adults remain susceptible.
In the tropics, chickenpox often occurs in older people and may cause more serious disease.[67] In adults, the pock marks are darker and the scars more prominent than in children.[68]
In the United States, the Centers for Disease Control and Prevention (CDC) does not require state health departments to report infections of chickenpox, and only 31 states currently volunteer this information.[69] However, in a 2013 study conducted by the social media disease surveillance tool called Sickweather, anecdotal reports of chickenpox infections on Facebook and Twitter were used to measure and rank states with the most infections per capita, with Maryland, Tennessee and Illinois in the top three.[70]
Etymology[edit]
Why the term was used is not clear but it may be due to it being a relatively mild disease.[14] It has been said to be derived from chickpeas, based on resemblance of the vesicles to chickpeas,[14][71][72] or to come from the rash resembling chicken pecks.[72] Other suggestions include the designation chicken for a child (i.e., literally 'child pox'), a corruption of itching-pox,[71][73] or the idea that the disease may have originated in chickens.[74] Samuel Johnson explained the designation as "from its being of no very great danger".[75]
Society and culture[edit]
Because chickenpox is usually more severe in adults than it is in children, some parents deliberately expose their children to the virus, sometimes by taking them to "chickenpox parties". Doctors counter that children are safer getting the vaccine, which is a weakened form of the virus, rather than getting the disease, which can be fatal.[76]
Other animals[edit]
Humans are the only known species that the disease affects naturally.[7] However, chickenpox has been caused in other animals, such as primates, including chimpanzees[77] and gorillas.[78]
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Jump up ^ Gnann Jr, John W. (2007). "Chapter 65Antiviral therapy of varicella-zoster virus infections". In Arvin, Ann; et al. Human herpesviruses : biology, therapy, and immunoprophylaxis. Cambridge: Cambridge University Press. ISBN 978-0-521-82714-0. Retrieved 20 January 2014.
Jump up ^ Kay, A. B. (2001). "Allergy and allergic diseases. First of two parts". The New England Journal of Medicine. 344 (1): 30–7. doi:10.1056/NEJM200101043440106. PMID 11136958.
Jump up ^ Kay, A. B. (2001). "Allergy and allergic diseases. Second of two parts". The New England Journal of Medicine. 344 (2): 109–13. doi:10.1056/NEJM200101113440206. PMID 11150362.
^ Jump up to: a b "Antiviral medications for chickenpox". Archived from the original on 28 December 2010. Retrieved 27 March 2011.
Jump up ^ "Chickenpox in Children Under 12". Retrieved 6 November 2010.
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Jump up ^ "What is chickenpox?". Retrieved 6 November 2010.
Jump up ^ Chickenpox~treatment at eMedicine
Jump up ^ US Centers for Disease Control and Prevention. "Varicella Treatment Questions & Answers". CDC Guidelines. CDC. Archived from the original on 17 July 2007. Retrieved 23 August 2007.
Jump up ^ Baren JM, Henneman PL, Lewis RJ (August 1996). "Primary Varicella in Adults: Pneumonia, Pregnancy, and Hospital Admissions". Annals of Emergency Medicine. 28 (2): 165–169. doi:10.1016/S0196-0644(96)70057-4. PMID 8759580.
^ Jump up to: a b Mohsen AH, McKendrick M (May 2003). "Varicella pneumonia in adults". Eur. Respir. J. 21 (5): 886–91. doi:10.1183/09031936.03.00103202. PMID 12765439. Archived from the original on 6 September 2008.
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Jump up ^ "Definition of Chickenpox". MedicineNet.com. Archived from the original on 28 July 2006. Retrieved 18 August 2006.
Jump up ^ "Is Necrotizing Fasciitis a complication of Chickenpox of Cutaneous Vasculitis?". atmedstu.com. Archived from the original on 15 April 2008. Retrieved 18 January 2008.
Jump up ^ Strangfeld A, Listing J, Herzer P, Liebhaber A, Rockwitz K, Richter C, Zink A (February 2009). "Risk of herpes zoster in patients with rheumatoid arthritis treated with anti-TNF-alpha agents". JAMA. 301 (7): 737–44. doi:10.1001/jama.2009.146. PMID 19224750.
Jump up ^ Weller TH (1997). "Varicella-herpes zoster virus". In Evans AS, Kaslow RA. Viral Infections of Humans: Epidemiology and Control. Plenum Press. pp. 865–92. ISBN 978-0-306-44855-3.
^ Jump up to: a b Chicken Pox Complications Archived 28 April 2008 at the Wayback Machine.
Jump up ^ Wharton M (1996). "The epidemiology of varicella-zoster virus infections". Infect Dis Clin North Am. 10 (3): 571–81. doi:10.1016/S0891-5520(05)70313-5. PMID 8856352.
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Jump up ^ "Georgia ranks 10th for social media admissions of chickenpox". Archived from the original on 21 June 2013. Retrieved 13 June 2013.
Jump up ^ "Chickenpox in the USA". Archived from the original on 26 July 2013. Retrieved 12 June 2013.
^ Jump up to: a b Belshe, Robert B. (1984). Textbook of human virology (2nd ed.). Littleton MA: PSG. p. 829. ISBN 0-88416-458-6.
^ Jump up to: a b Teri Shors (2011). "Herpesviruses: Varicella Zoster Virus (VZV)". Understanding Viruses (2nd ed.). Jones & Bartlett. p. 459. ISBN 978-0-7637-8553-6. Archived from the original on 1 October 2014.
Jump up ^ Pattison, John; Zuckerman, Arie J.; Banatvala, J.E. (1994). Principles and practice of clinical virology (3rd ed.). Wiley. p. 37. ISBN 0-471-93106-3.
Jump up ^ Chicken-pox is recorded in Oxford English Dictionary 2nd ed. since 1684; the OED records several suggested etymologies
Jump up ^ Johnson, Samuel (1839). Dictionary of the English language. London: Williamson. p. 195.
Jump up ^ "Chicken Pox parties do more harm than good, says doctor". KSLA News 12 Shreveport, Louisiana News Weather & Sports. Archived from the original on 27 January 2012.
Jump up ^ Cohen JI, Moskal T, Shapiro M, Purcell RH (December 1996). "Varicella in Chimpanzees". Journal of Medical Virology. 50 (4): 289–92. doi:10.1002/(SICI)1096-9071(199612)50:4<289::AID-JMV2>3.0.CO;2-4. PMID 8950684.
Jump up ^ Myers MG, Kramer LW, Stanberry LR (December 1987). "Varicella in a gorilla". Journal of Medical Virology. 23 (4): 317–22. doi:10.1002/jmv.1890230403. PMID 2826674.
External links[edit]
Classification
D
ICD-10: B01
ICD-9-CM: 052
DiseasesDB: 29118
External resources
MedlinePlus: 001592
eMedicine: ped/2385 derm/74, emerg/367
Patient UK: Chickenpox
Medicine portal
Viruses portal
Wikipedia's health care articles can be viewed offline with the Medical Wikipedia app.
Wikimedia Commons has media related to Chickenpox.
Chickenpox at Curlie (based on DMOZ)
"Prevention of Varicella: Recommendations of the Advisory Committee on Immunization Practices (ACIP)". Centers for Disease Control and Prevention (CDC). 12 July 1996. Retrieved 18 May 2013.
"Management of Varicella Zoster Virus (VZV) Infections" (PDF). Federal Bureau of Prisons: Clinical Practice Guideline. December 2011. Archived from the original (PDF) on 19 February 2013. Retrieved 18 May 2013.
John W. Gnann Jr. (2007). "Chapter 65 Antiviral therapy of varicella-zoster virus infections". PMID 21348091.
Sarah McSweeney-Ryan; Megan Sandel. "The Health Care of Homeless Persons - Part I - Varicella (Chickenpox" (PDF). Boston Health Care for the Homeless Program. Archived from the original (PDF) on 8 September 2015. Retrieved 18 May 2013.
Hamborsky, Jennifer. "Epidemiology and Prevention of Vaccine-Preventable Diseases: Varicella" (PDF). CDC.
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Michiaki Takahashi
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Modified varicella-like syndrome

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Exanthema subitum

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values: Papular purpuric gloves and socks syndrome

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Merkel cell carcinoma

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Hand, foot and mouth disease

values: Asymmetric periflexural exanthem of childhood

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