Fight the Bite
"Mosquitoes are out and biting and spreading West Nile virus," said LDH State Epidemiologist Dr. Raoult Ratard. "Protecting yourself is very simple and it could spare you from getting this disease."
Humans contract West Nile when they are bitten by mosquitoes infected with the virus. When people are infected with West Nile, the virus will affect them one of three ways. West Nile neuroinvasive disease is the most serious type, infecting the brain and spinal cord. Neuroinvasive disease can lead to death, paralysis and brain damage. The milder viral infection is West Nile fever, in which people experience flu-like symptoms. The majority of people who contract West Nile will be asymptomatic, which means they show no symptoms. These cases are typically detected through blood donations or in the course of other routine medical tests.
About 90 percent of all cases are asymptomatic, while about 10 percent will develop West Nile fever. Only a very small number of infected individuals will show the serious symptoms associated with the neuroinvasive disease. Residents who are 65 years old and older are at higher risk for complications, but everyone is at risk for infection.
- If you will be outside, you should wear a mosquito repellent containing DEET. The American Academy of Pediatrics (AAP) recommends that repellents should contain no more than 30 percent DEET when used on children. Insect repellents also are not recommended for children younger than 2 months of age. CDC recommends that you always follow the recommendations appearing on the product label when using repellent.
- Apply repellent on exposed skin and clothing. Do not apply under your clothes or on broken skin.
- To apply repellent to your face, spray on your hands and then rub on your face, avoiding your eyes.
- Adults should always apply repellent to children.
- Wear long-sleeved shirts and pants when outdoors for long periods of time.
- Avoid perfumes and colognes when outdoors for extended periods of time.
- Make sure that your house has tight-fitting windows and doors, and that all screens are free of holes.
Protecting Your Home
- Reduce the mosquito population by eliminating standing water around your home, which is where mosquitoes breed.
- Dispose of tin cans, ceramic pots and other unnecessary containers that have accumulated on your property. Turn over wheelbarrows, plastic wading pools, buckets, trash cans, children's toys or anything that could collect water.
- Drill holes in the bottom of outdoor recycling containers. Drainage holes that are located on the container sides collect enough water for mosquitoes to breed.
- Check and clean roof gutters routinely. They are often overlooked, but can produce millions of mosquitoes each season.
- Aerate ornamental pools or stock them with fish. Water gardens can become major mosquito producers if they are allowed to stagnate.
- Clean and chlorinate swimming pools that are not being used. A swimming pool that is left untended by a family for a month can produce enough mosquitoes to result in neighborhood-wide complaints. Be aware that mosquitoes may even breed in the water that collects on swimming pool covers.
Chikungunya, Dengue and Zika Viruses
Nearly all dengue cases reported in the 48 continental states were acquired elsewhere by travelers or immigrants. Prior to 2006, chikungunya virus disease was rarely identified in U.S. travelers. Beginning in 2014, chikungunya virus disease cases were reported among U.S. travelers returning from affected areas in the Americas and local transmission was identified in Florida, Puerto Rico, and the U.S. Virgin Islands. Beginning in 2015, the first local transmission of Zika virus in the Americas was reported in Brazil. Following the spread of Zika virus throughout the Caribbean and the Americas, there was marked reported increase in the number of infections reported among travelers. Because contact between Aedes sp. mosquitoes and people is infrequent in the continental U.S., these imported cases rarely result in local transmission in the continental U.S.
LDH continues to monitor chikungunya, dengue, and Zika virus infections, and include any reported cases in its weekly Arbovirus Surveillance Summaries. All of Louisiana's reported chikungunya, dengue, and Zika virus infections have been associated with travel to areas with active transmission.
Annual reports by disease can be found at here.
Anyone traveling abroad should also take the precautions listed above to protect themselves from mosquitoes in other countries. Mosquitoes in other parts of the world including the Caribbean, South America, Asia, Africa or Europe might infect you with chikungunya or dengue fever. For more information about these diseases, visit the CDC's website by clicking here.
- West Nile Virus Reports 2019
- West Nile Virus Reports 2018
- West Nile Virus Reports 2017
- West Nile Virus Reports 2016
- West Nile Virus Reports 2015
- West Nile Virus Weekly Reports 2014
- Infectious Disease and West Nile Virus News Release Updates
- CDC West Nile Virus Health Education Materials
- Louisiana Office of Public Health West Nile Virus Information