U.S. health officials reported Wednesday three times the usual number of West Nile cases for this time of year and one expert called it "one of the largest" outbreaks since the virus appeared in the country in 1999.
South Carolina has also experienced an increase in West Nile cases after none were reported in 2011.
So far, 1,118 illnesses have been reported nationwide, about half of them in Texas, according to the Centers for Disease Control and Prevention. In an average year, fewer than 300 cases are reported by mid-August. There have also been 41 deaths this year.
"We're in the midst of one of the largest West Nile outbreaks ever seen in the United States," said Dr. Lyle Petersen, a CDC official.
Never before have so many illnesses been reported this early, said Petersen, who oversees the CDC's mosquito-borne illness programs.
South Carolina has had 22 confirmed cases this year, including 12 humans, eight birds and two animals, according to Jim Beasley, a spokesman for the S.C. Department of Health and Environmental Control.
"We know West Nile virus exists in South Carolina," Beasley said Wednesday. "However, it's very important to remember that many people who are exposed to (the virus) from infected mosquitoes never develop symptoms. A small portion develop mild flu-like symptoms. And then in a very small number of cases, the symptoms can be more serious."
IN BEAUFORT COUNTY
West Nile virus was discovered in Beaufort during routine testing of mosquitoes in July, but no people or animals have tested positive this year.
Gregg Hunt, director of Beaufort County Mosquito Control, suggested the county's anti-mosquito efforts may be one reason. Spraying from the ground and the air occurs most weeks. This spring, crews also treated all 19,000 catch basins throughout the county.
ACROSS THE COUNTRY
Most infections are usually reported in August and September, so it's too early to tell how bad this year will be, CDC officials said. They think the mild winter, early spring and very hot summer have fostered breeding of mosquitoes that pick up the virus from birds they bite and then spread it to people.
West Nile virus was first reported in the U.S. in 1999 in New York and gradually spread across the country. It peaked in 2002 and 2003, when severe illnesses reached nearly 3,000 and deaths surpassed 260. Last year there were fewer than 700 cases.
Only about one in five infected people get sick. One in 150 infected people will develop severe symptoms including neck stiffness, disorientation, coma and paralysis.
In recent years, cases have been scattered across the country. Hot spots are usually in southeast Louisiana, central and southern California, and areas around Dallas, Houston, Chicago and Phoenix.
Those areas seem to have a combination of factors that include the right kinds of virus-carrying mosquitoes and birds, along with large numbers of people who can be infected, health officials say.
The best way to prevent West Nile disease is to avoid mosquito bites. Insect repellents, screens on doors and windows, and wearing long sleeves and pants are some of the recommended strategies. Also, empty standing water from buckets, kiddie pools and other places to discourage breeding.
Island Packet staff reporter Casey Conley contributed to this report.