Introduction to rotavirus:

Rotavirus is extremely contagious. Day cares, preschools, and homes with young children are invisible forests of rotavirus. The living, spreading virus remains active on human hands for at least 4 hours, on hard dry surfaces for 10 days, and on wet areas for weeks! Want a good reason to carry a little bottle in your purse, glove compartment, or pocket? Do you dislike vomiting and feeling nauseated? Alcohol-based instant hand sanitizers kill rotavirus in seconds.

What is rotavirus?

Rotavirus is a global problem. It is the leading cause both of routine vomiting and diarrhea illnesses, and of severe, life-threatening diarrhea in every country in the world.

Who gets rotavirus?

Everybody. Almost every child on the planet becomes infected by age 5. The older and healthier the child is when infected, and the fewer viral particles swallowed, the milder the disease.

The typical story is of a child between the ages of 3 months and 2 years. On average, those in day care and those who are not breastfed tend to get sick at the earlier end of that spectrum, when they are more vulnerable.

Re-infections are common, but usually not as severe. One third to one half of exposed adults will get a mild infection when exposed to an ill child.

Most cases occur between November and May in the temperate climates of the northern hemisphere. In the US, rotavirus often moves across the country in a wave. It usually starts in the southwest in November or December and ends in the northeast in April or May.

In the developed countries, the health-care system protects most children from the worst ravages of this disease. Still, in the US rotavirus is responsible for more than 3.5 million diarrhea illnesses, half a million physician visits, 50,000 hospitalizations, and 20 tragic deaths each year. Many places in the world are not so fortunate.

What are the symptoms of rotavirus?

The infection usually begins with a mild to moderate fever. Soon the little one begins to vomit and has a nasty tummy-ache. The vomiting and fever go away after a day or two, followed by watery diarrhea that lasts from 3 to 9 (usually 5 to 7) days. Most of the time, kids recover with little difficulty.

Sometimes, severe dehydration results. The extreme dehydration that can be caused by rotaviruses is second only to the dehydration caused by cholera.

Is rotavirus contagious?

Rotavirus is extremely contagious. Only a very few particles are needed to transmit infection. They are found in the stool in very high concentrations, beginning before the illness. They are also found throughout the environment wherever young children spend much time, especially during the winter months.

How long does rotavirus last?

Most children develop symptoms within 48 hours of swallowing the virus. Symptoms are usually over within 9 days, and sometimes sooner. High concentrations of virus remain in the stool for 10 to 12 days after the symptoms begin in otherwise healthy children.

How is rotavirus diagnosed?

The diagnosis is often based on the history and the physical exam.