Revellers at a carnival in Sao Paulo wear mosquito masks in a reference to the Aedes aegypti mosquito, which can spread dengue and Zika on February 4, 2016.
Paulo Whitaker/Reuters
What is the difference between these pathogens, and how dangerous are they?
A man undergoes “xenodiagnosis” for Chagas disease in the Argentine province of Corrientes. In this procedure, uninfected triatomine bugs feed on the blood of patients. Later examination of these insects may reveal parasites acquired from infected blood.
German Pomar/Reuters
This parasitic infection is endemic in Central and South America, and can lead to serious health complications. Though rare in the US, incidence is starting to increase.