This week, the Louisiana Department of Health has confirmed four additional case of Zika virus. As in all of the other cases in Louisiana, the patients travelled to regions in the Americas with ongoing Zika transmission and sought medical care in Louisiana after returning, where tests confirmed the viral infection.  
This brings the total to 23 cases of travel-associated Zika confirmed in Louisiana. Although the state of Florida has reported several locally transmitted cases in that state, this is not the situation in Louisiana. Local transmission occurs when an infected mosquito in the area bites another person in the area and transmits the virus. This local transmission is much more likely in the parishes around Lake Pontchartrain than other areas of the state. 
National and state case counts compiled by the CDC can be found here. Once a travel-related case is identified, public health officials and local mosquito control agencies are notified to take action to minimize the potential for local spread. 
Detection Efforts for Local Transmission in Louisiana
Although no locally-transmitted cases have yet been found in Louisiana, public health officials are on high alert to detect and report Zika virus cases as early as possible. According to Dr. Frank Welch, Medical Director for the department’s Bureau of Community Preparedness, the early detection of local transmission of the Zika virus is a key strategy to prevent its spread. 
“Our surveillance activities include working with hospitals and other health care providers who notify us if and when a possible Zika case is diagnosed,” Welch said. “We also work with mosquito control agencies throughout the state who conduct mosquito testing in areas of known human cases to determine if mosquitos in those areas are carrying the virus.” 
Prevention: Avoiding a Zika Infection
State health officials are also working closely with local officials and the healthcare community throughout Louisiana to educate and implement prevention strategies against the local spread of the Zika virus.  Working with parishes where we have both returning travelers from Zika-affected areas and the mosquito that spreads Zika is doubly important.   
Zika virus is of greatest threat to pregnant women, as their child may be at risk for certain severe birth defects as a result of infection. Pregnant women and women trying to get pregnant should avoid travel to areas with Zika transmission. The CDC has a list of travel notices for these areas here. Because Zika can spread through sexual activity, pregnant women should have their partners use a condom correctly every time or abstain from sex.  
All travelers to areas where Zika virus is active should be aware and take the following steps to protect themselves from mosquito bites:
  • Use an EPA-approved insect repellent
  • Wear light-colored, long sleeves and pants.
  • Sleep under a mosquito net if you are outdoors or in an area without door and window screens.
The same precautions apply at home, and people should also make sure their house is mosquito-proof by ensuring their windows and doors have intact screens. Once a week or after every rainfall, empty standing water from any containers around your home, especially in small containers.  
For more information about preventing Zika virus, visit
The Louisiana Department of Health strives to protect and promote health statewide and to ensure access to medical, preventive and rehabilitative services for all state residents. To learn more about LDH, visit For up-to-date health information, news and emergency updates, follow LDH's Twitter account and Facebook.