The confluence of the Zika outbreak in Latin America and the Rio Olympic games has led some athletes to make a tough decision: forgoing competition to avoid the disease. This week, the Centers for Disease Control (CDC) confirmed homegrown transmissions of the virus in the US. These developments lead to questions about how significant Zika is as a public health hazard, and whether the Olympics will increase its spread into countries that don't currently have it. An article in FiveThirtyEight explains why the latter isn't a major concern: despite Brazil being the origin of the current Zika outbreak, there are a lot more tourists to the entire outbreak area than people traveling to the Olympics. In other words, "a 30-person Olympic delegation and 100 spectators don’t present much additional risk to a country that’s already seeing 50,000 visitors a year from areas with Zika." For countries like the US, which already have an active, mosquito-borne outbreak, experts like Michael Osterholm of Consortium member the Center for Infectious Disease Research & Policy (CIDRAP) emphasize the importance of basic public health measures. In an interview on the Diane Rehm Show, Osterholm recommended focusing on "eliminating the breeding sites – the water sources, the garbage. We now live in a plastic garbage world where one bottle cap sitting in a ditch is more than enough, is a great breeding site for this mosquito." CIDRAP maintains a Zika website that's a up-to-date, scientifically accurate, and global in scope; here's a link.