A resident reacts as a national health official carries out fumigation to help control the spread of Chikungunya and dengue fever, which are caused by viruses carried by mosquitoes, in Rio Claro, Sao Paulo March 6, 2015. Brazil already has more than 100,000 cases of people with dengue in 2015, according to the City Department of Health. REUTERS/Paulo Whitaker (BRAZIL - Tags: SOCIETY HEALTH)