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Legionnaire's disease, which hit Quebec in mid-July, has infected 65 people and killed six, health authorities of the French-speaking Canadian province said.
“We are very concerned by the current situation,” Quebec public health chief Francois Desbiens said.
“It's the largest legionellosis outbreak in Canada in recent years.”
Sixteen new cases were reported on Thursday alone.
Health authorities suspect improper maintenance of cooling towers in air conditioning systems are at fault for the outbreak.
Legionella bacteria grow in stagnant water in such appliances, then spread with droplets expelled by the system during operation.
The 68 cooling towers housed in 28 buildings were inspected, cleaned and disinfected, but the operation has not put an end to the epidemic.
The disease, which poses a risk for people with weak immune systems, can be treated with antibiotics.
Legionnaire's disease Ä discovered in 1976 during a veterans convention in the United States, where 29 people died Ä is an infection that causes high fever, dry cough and pneumonia. - Sapa-AFP