have been detected in Colombia, a number that could rise to 700,000, with health experts warning the epidemic may spread across Latin America.
Zika and Chikungunya viruses, which are all carried by the same species of mosquito.
According to the WHO, in adults, the viral disease usually causes a mild fever, rash, headaches, arthralgia, myalgia, asthenia and non-purulent conjunctivitis.
To combat the virus, which is spread by the Aedes aegypti mosquito, is to clear bodies of stagnant water.
Brazilian government reported 3,500 cases of the virus, which can cause severe developmental issues, brain damage and sometimes death. Ie., Zikha.
3,530 babies have been born with microcephaly in the country since October: a steep rise from 2014, when fewer than 150 such cases were recorded.
Brazil is the most gravely affected among the 20 countries in the region that have been hit by the virus.