Bossier Parish, LA — The Louisiana Department of Health and Hospitals continues to detect West Nile cases up to the year's end, with state health officials reporting 11 new cases and one new death this week.
Louisiana is experiencing its worst West Nile outbreak in a decade this year, and nationwide, West Nile cases are the highest they have been since 2003. Louisiana is among the 13 states with the highest case counts, though according to the federal Centers for Disease Control and Prevention, a third of the West Nile cases in the country are reported from the neighboring state of Texas.
"People expect to see West Nile cases slow down because we've started having subfreezing temperatures. But, it's important to recognize that mosquitos can hide in culverts or other sheltered areas, then reemerge when the weather gets warmer," said DHH Secretary Bruce D, Greenstein. "We've seen a lot of fluctuating weather around Louisiana, where it's cold one day and warm the next, so West Nile is still a health threat."
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.
There are four new neuroinvasive disease cases reported this week, with one each from Bossier, Calcasieu, St. Helena and Winn parishes.
There are five new West Nile fever cases reported this week, with one each from Bossier, Cameron, Concordia, East Feliciana and Orleans parishes.
Two new asymptomatic cases were reported this week, from Grant and Pointe Coupee parishes.
Louisiana has had 382 West Nile cases, of which 156 are neuroinvasive disease, and 17 deaths, all of which occurred within two weeks of disease onset, thus far in 2012.
DHH issues a weekly Arbovirus Surveillance Report that details cases detected thus far by parish, which is published here.
West Nile virus has been present in Louisiana since 2002, when the state experienced 328 cases, of which 204 were neuroinvasive disease, and 24 deaths. For 10 years, state health officials have conducted robust surveillance year-round, which includes working with doctors, hospitals and health care providers around the state to track human cases and reminding people to be vigilant in avoiding mosquito bites.