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Arboviral Infections
(arthropod-borne encephalitis, eastern equine encephalomyelitis,
St. Louis encephalitis, California encephalitis)
What are arboviral infections?
Arboviral (short for arthropod-borne) infections are caused by any
of a number of viruses transmitted by arthropods such as mosquitoes
and ticks. These infections generally occur during warm weather months
when mosquitoes are active.
Who gets arboviral infections?
Anyone can get an arboviral infection but young children and the elderly
appear to be most susceptible.
How are arboviral infections spread?
Most arboviral infections are spread by infected mosquitoes. Fortunately,
only a few types of mosquitoes are capable of transmitting the disease
and only a small number of the mosquitoes are actually carrying the
virus. Occasionally, migrating birds have the ability to carry viruses
from one area of the country to another.
What are the symptoms of arboviral infections?
Symptoms of the various types of viral infections transmitted by mosquitoes
are usually similar but differ in severity. Most infections do not result
in any symptoms. Mild cases may occur with only a slight fever and/or
headache. Severe infections are marked by a rapid onset, headache, high
fever, disorientation, coma, tremors, convulsions, paralysis or death.
How soon after exposure do symptoms occur?
Symptoms usually occur five to 15 days after exposure to infective
mosquitoes.
Does past infection with an arbovirus make a person immune?
Yes, infection with an arbovirus can provide immunity to that specific
virus and perhaps to other related viruses.
What is the treatment for an infection due to an arbovirus?
The physician will usually attempt to relieve the symptoms of the
illness, but there is no specific treatment available for arbovirus
infections.
How can arboviral infections be prevented?
Insect repellents can be used when outdoors in mosquito-infested areas.
Homes can be screened to prevent entry of mosquitoes. Communities or
municipalities may establish a mosquito surveillance or control program
to reduce mosquito populations by applying pesticides and draining swampy
areas.
Updated: April 1996
Source: NY State Department of Health
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