Two men and a woman have tested positive for West Nile virus, Suffolk County health officials said Monday, bringing to 10 the number of Long Islanders infected with the disease most commonly spread by mosquitoes.

Four of the infected -- all adults -- are in Suffolk, including the three new cases announced Monday by Suffolk County Health Services.

On Friday, Nassau County reported a sixth resident, an 80-year-old from the Town of Hempstead, had been infected with West Nile.

The new Suffolk cases are all residents of the Town of Islip and all younger than 55, the county said in a news release.

One of the men started experiencing symptoms consistent with the disease on Aug. 24; he saw his health care professional for treatment, was not hospitalized and has recovered, officials said.

Another, a woman, began experiencing symptoms on Sept. 7, visited her health care professional and also was not hospitalized. She is recovering at home, officials said.

The other man started feeling symptoms on Sept. 18; he was hospitalized for a week and is recovering at home.

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Suffolk County's first case this season of the virus was reported on Sept. 10.

Last year, Suffolk County reported one human case of West Nile virus and four cases in both 2011 and 2013; 14 were reported in 2012 and 25 cases in 2010, a year in which the virus killed three.

This year, no deaths related to the virus have been reported.