Longtime Newbury residents can’t remember the last time their North Shore town was under high alert for risk of infection from mosquito-borne eastern equine encephalitis. In Cambridge, health officials have discussed spraying pesticide for the first time in 12 years to kill mosquitoes carrying West Nile virus, after two residents were recently sickened by the disease. In Massachusetts and across the country, unprecedented levels of disease-carrying mosquitoes are spreading fears and challenging many communities not used to grappling with such an elusive foe.
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