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LUSBY, Md. (WUSA) -- Calvert County Department of Health officials have not confirmed that "Influenza A" killed three people in a Lusby home, but say it was a contributing factor.

Influenza A is the virus that is most commonly known as the flu in humans. However, if not treated properly, as in these cases, it can prove to be deadly.

"The first case of illness occurred in an 81-year-old woman who presented symptoms at her home beginning on or about February 23, 2012. She was cared for at home by three of her children, a son and two daughters. The caregivers developed similar upper respiratory symptoms on or about February 28, 2012. All were hospitalized and became critically ill. The elderly woman, a 58-year-old son and a 56-year-old daughter subsequently died. A third family member and caregiver is currently hospitalized at the Washington Hospital Center," CCHD officials said.

Residents are recommended to take standard precautions to prevent the spread of illness including hand washing and limiting contact with sick individuals. Those with flu-like symptoms should check with their healthcare provider to be evaluated.

Health officials say if you think you have similar symptoms, you should check with a doctor immediately.

"In the meantime, we continue to recommend that people ill with influenza-like illnesses (fever and cough or sore throat) check in with their healthcare provider to be evaluated and see if they would benefit from antiviral or other medications," officials said.