Health workers in Belo Horizonte don protective gear to fumigate homes and business against dengue fever. Brazil will start a vaccination campaign against the virus in February, as a sharp rise in cases of the potentially deadly disease raised fears of a runaway outbreak. "We have been looking at the El Niño phenomenon, these record high temperatures from last year, as a new, determining factor," says Fabio Baccheretti, the President of National Council of Health Secretaries. IMAGES AND SOUNDBITES