A health article about chickenpox from Your Health Online the A to Z directory of dealing with Health Problems & nutritional Self Care Strategies
Chickenpox (also called varicella) is a common and extremely infectious childhood disease that also affects adults on occasion.
It produces an itchy, blistery rash that typically lasts about a week and is sometimes accompanied by a fever or other symptoms.
A single attack of the disease almost always brings lifelong immunity against the disease.
Because the symptoms are easily recognized and in most cases merely unpleasant rather than dangerous, treatment can almost always be carried out at home.
Severe complications can develop, however, and professional medical attention is essential in some circumstances.
A case of chickenpox usually starts without warning or with only a mild fever and a slight feeling of unwellness.
Within a few hours or days small red spots begin to appear on the scalp, neck, or upper half of the trunk.
After a further 12-24 hours the spots typically become itchy, fluid-filled bumps called vesicles, which continue to appear in crops for the next two to five days.
In any area of skin, lesions of a variety of stages can be seen.
These blisters can spread to cover much of the skin, and in some cases also may be found inside the mouth, nose, ears, vagina, or rectum.
Some people develop only a few blisters, but in most cases the number reaches 250-500.
The blisters soon begin to form scabs and fall off.
Scarring usually does not occur unless the blisters have been scratched and become infected.
Occasionally a minor and temporary darkening of the skin (called hyperpigmentation) is noticed around some of the blisters.
The degree of itchiness can range from barely noticeable to extreme.
Some sufferers also have headaches, abdominal pain, or a fever.
Full recovery usually takes five to 10 days after the first symptoms appear.
Again, the most severe cases of the disease tend to be found among older children and adults.
Before the varicella vaccine (Varivax) was released for use in 1995, nearly all of the four million children born each year in the United States contracted chickenpox, resulting in hospitalization in five of every 1,000 cases and 100 deaths.
Chickenpox is caused by the varicella-zoster virus (a member of the herpes virus family), which is spread through the air or by direct contact with an infected person.
Once someone has been infected with the virus, an incubation period of about 10-21 days passes before symptoms begin.
The period during which infected people are able to spread the disease is believed to start one or two days before the rash breaks out and to continue until all the blisters have formed scabs, which usually happens four to 7 days after the rash breaks out but may be longer in adolescents and adults.
For this reason, doctors recommend keeping children with this condition away from school for about a week.
It is not necessary, however, to wait until all the scabs have fallen off.
Chickenpox has been a typical part of growing up for most children in the industrialized world (although this may change if the new varicella vaccine becomes more widely accepted).
The disease can strike at any age, but by ages nine or 10 about 80-90% of American children have already been infected. U.S. children living in rural areas and many foreign-born children are less likely to be immune.
Because almost every case of chickenpox, no matter how mild, leads to lifelong protection against further attacks, adults account for less than 5% of all cases in the United States.
Study results reported by the Centers for Disease Control and Prevention (CDC) indicate that more than 90% of American adults are immune to this virus.
Adults, however, are much more likely than children to suffer dangerous complications. More than half of all chickenpox deaths occur among adults.
Chickenpox is caused by the varicella-zoster virus (VZV), also known as human herpes virus 3 (HHV-3), one of the eight herpes viruses known to affect humans.
It starts with conjunctival and catarrhal symptoms and then characteristic spots appearing in two or three waves, mainly on the body and head rather than the hands and becoming itchy raw pox (pocks), small open sores which heal mostly without scarring.
Chickenpox has a 10-21 day incubation period and is highly contagious through physical contact two days before symptoms appear.
Following primary infection there is usually lifelong protective immunity from further episodes of chickenpox.
Chickenpox is rarely fatal (usually from varicella pneumonia), with pregnant women and those with a suppressed immune system being more at risk.
Pregnant women not known to be immune and who come into contact with chickenpox may need urgent treatment as the virus can cause serious problems for the fetus. This is less of an issue after 20 weeks.
The most common complication of this condition is shingles; this is most frequently a late effect.
Although for most people chickenpox is no more than a matter of a few days' discomfort, some groups are at risk for developing complications, the most common of which are bacterial infections of the blisters, pneumonia, dehydration, encephalitis, and hepatitis:
Immediate medical help should always be sought when anyone in these high-risk groups contracts the disease.
A substance known as varicella-zoster immune globulin (VZIG), which reduces the severity of symptoms, is available to treat immunocompromised children and others at high risk of developing complications.
It is administered by injection within 96 hours of known or suspected exposure to the disease and is not useful after that. VZIG is produced as a gamma globulin from blood of recently infected individuals.
A vaccine for chickenpox became available in the United States in 1995 under the name Varivax. Varivax is a live, attenuated (weakened) virus vaccine.
It has been proven to be 85% effective for preventing all cases of chickenpox and close to 100% effective in preventing severe cases. Side effects are normally limited to occasional soreness or redness at the injection site.
CDC guidelines state that the vaccine should be given to all children (with the exception of certain high-risk groups) at 12-18 months of age, preferably when they receive their measles-mumps-rubella vaccine.
For older children, up to age 12, the CDC recommends vaccination when a reliable determination that the child in question has already had chickenpox cannot be made.
Vaccination also is recommended for any older child or adult considered susceptible to the disease, particularly those, such as health care workers and women of childbearing age, who face a greater likelihood of severe illness or transmitting infection.
A single dose of the vaccine was once thought sufficient for children up to age 12; older children and adults received a second dose four to eight weeks later.
However, an outbreak at a daycare center in 2000 brought concern in the medical community about a second vaccination for younger children, since many of the affected children had been vaccinated. Researchers began recommending a second vaccination in 2002.
In 1997 the cost of two adult doses of the vaccine in the United States was about $80.
Although this cost was not always covered by health insurance plans, children up to age 18 without access to the appropriate coverage could be vaccinated free of charge through the federal Vaccines for Children program.
Varivax is not given to patients who already have overt signs of the disease. It was once thought unsafe for children with chronic kidney disease, but a 2003 report said the vaccination was safe in these children.
The finding is important, since even chickenpox can be a serious complication in children who must undergo a kidney transplant.
The vaccine also is not recommended for pregnant women, and women should delay pregnancy for three months following a complete vaccination.
The vaccine is useful when given early after exposure to chickenpox and, if given in the midst of the incubation period, it can be preventative.
The Infectious Diseases Society of America stated in 2000 that immunization is recommended for all adults who have never had chickenpox.
While there was initial concern regarding the vaccine's safety and effectiveness when first released, the vaccination is gaining acceptance as numerous states require it for admittance into daycare or public school.
In 2000, 59% of toddlers in the United States were immunized; up from 43.2% in 1998.
A study published in 2001 indicates that the varicella vaccine is highly effective when used in clinical practice.
Although evidence has not ruled out a booster shot later in life, all research addressing the vaccine's effectiveness throughout its six-year use indicates that chickenpox may be the first human herpes virus to be wiped out.
Although initial concerns questioned if the vaccination might make shingles more likely, studies are beginning to show the effectiveness of the vaccine in reducing cases of that disease.
Where children are concerned, especially those with recent exposure to the disease, diagnosis can usually be made at home, by a school nurse, or by a doctor over the telephone if the child's parent or caregiver is unsure that the disease is chickenpox.
A doctor should be called immediately if:
With children, treatment usually takes place in the home and focuses on reducing discomfort and fever. Because chickenpox is a viral disease, antibiotics are ineffective against it.
Applying wet compresses or bathing the child in cool or lukewarm water once a day can help the itch. Adding four to eight ounces of baking soda or one or two cups of oatmeal to the bath is a good idea (oatmeal bath packets are sold by pharmacies). Only mild soap should be used in the bath. Patting, not rubbing, is recommended for drying the child off, to prevent irritating the blisters. Calamine lotion (and some other kinds of lotions) also help to reduce itchiness. Because scratching can cause blisters to become infected and lead to scarring, the child's nails should be cut short. Of course, older children need to be warned not to scratch. For babies, light mittens or socks on the hands can help guard against scratching.
If mouth blisters make eating or drinking an unpleasant experience, cold drinks and soft, bland foods can ease the child's discomfort. Painful genital blisters can be treated with an anesthetic cream recommended by a doctor or pharmacist. Antibiotics often are prescribed if blisters become infected.
Fever and discomfort can be reduced by acetaminophen or another medication that does not contain aspirin. Aspirin and any medications that contain aspirin or other salicylates must not be used with chickenpox, for they appear to increase the chances of developing Reye's syndrome. The best idea is to consult a doctor or pharmacist if unsure about which medications are safe.
Immunocompromised chickenpox sufferers are sometimes given an antiviral drug called acyclovir (Zovirax). Studies have shown that Zovirax also lessens the symptoms of otherwise healthy children and adults who contract chickenpox, but the suggestion that it should be used to treat the disease among the general population, especially in children, is controversial.
Alternative practitioners seek to lessen the discomfort and fever caused by chickenpox.
Like other practitioners, they suggest cool or lukewarm baths.
Rolled oats (Avena sativa) in the bath water help relieve itching.
(Oats should be placed in a sock, that is turned in the bath water to release the milky anti-itch properties.)
Other recommended remedies for itching include applying aloe vera, witch hazel, or herbal preparations of rosemary (Rosmarinus officinalis) and calendula (Calendual officinalis) to the blisters.
Homeopathic remedies are selected on a case by case basis.
Some common remedy choices are tartar emetic (antimonium tartaricum), windflower (pulsatilla), poison ivy (Rhus toxicodendron), and sulphur.
Most cases of chickenpox run their course within a week without causing lasting harm.
However, there is one long-term consequence of chickenpox that strikes about 20% of the population, particularly people 50 and older.
Like all herpes viruses, the varicella-zoster virus never leaves the body after an episode of chickenpox, but lies dormant in the nerve cells, where it may be reactivated years later by disease or age-related weakening of the immune system.
The result is shingles (also called herpes zoster), a painful nerve inflammation, accompanied by a rash, that usually affects the trunk or the face for 10 days or more.
Especially in the elderly, pain, called postherpetic neuralgia, may persist at the site of the shingles for months or years.
Two relatively newer drugs for treatment of shingles have become available. Both valacyclovir (Valtrex) and famciclovir (Famvir) stop the replication of herpes zoster when administered within 72 hours of appearance of the rash.
The effectiveness of these two drugs in immunocompromised patients has not been established, and Famvir was not recommended for patients under 18 years.
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