"This is the time of year when we begin seeing human cases of West Nile virus", Mark Pfister, the health department's executive director, said in the statement.
Half of the deaths were registered in Bucharest, with the other three being reported in Buzau, Braila, and Olt.
Ripley and Franklin Counties have previously had mosquitoes test positive for West Nile virus.
The majority of people infected with West Nile virus do not show any symptoms and most of those who do will experience mild illness which may include: fever, headache, body aches, nausea, vomiting or rashes on the chest, stomach or back. However, in the coming weeks, as floodwaters recede and form pools of stagnant standing water, the new pools may become breeding areas for the Aedes aegypti mosquitos that carry and spread the viruses.
Those pesky mosquitoes that torment your summer mornings and evenings may be more of a concern than an itchy bite.
"When the West Nile Virus hits, we spray in areas we don't usually, and residents may see us in adulticiding, fogging...if residents see us, don't be alarmed", Hougaard said. About one in five infected persons will have mild illness with fever, and about one in 150 infected people will become severely ill. A few people might develop severe symptoms in which hospitalization is required. However, some people - less than one percent - will develop serious neurologic illness such as encephalitis or meningitis.
So far, 148 birds in 44 MI counties have tested positive for the mosquito-borne virus. The latest involves a female, over the age of 50, that has the more serious neuroinvasive form of the illness.
Wear light colored, long-sleeved shirts and long trousers when outdoors. To avoid being bitten by mosquitoes, wear a mosquito repellent with DEET.
Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes.
Discard old tires, bottles, pots, broken appliances and other items not being used.