This lack of specific context for USA300 was a serious problem in most of the coverage. A couple of outlets, including London’s Daily Telegraph, reported that USA300 was discovered in 1999 after four children died in North Dakota. That is completely false; those deaths stemmed from a different type of staph infection entirely. Only The San Francisco Chronicle’s Sabin Russell accurately reported (or even bothered to mention) the history of USA300, that it was discovered in 2001 and how the new, multidrug-resistant strain was discovered in 2003. The Wall Street Journal also flubbed an important detail in its story, published last Tuesday. It reported that “gay men are thirteen time as likely to have” USA300 as heterosexuals, which is true, but only in San Francisco. By omitting those last four words, the Journal implied that the finding is national in scope, which is not the case.

In fact, the possibility that the infection will go national is a big worry for the study’s lead author, Dr. Binh Diep. Many articles noted that nearly 19,000 people died from MRSA infections in 2005, mostly from a weaker form of USA300, and a lot of the public uproar last week was the result of quotes from Diep fretting that the more virulent form could “spread to the general population.” It’s a legitimate concern, but again, context was missing from most articles. The new, multidrug-resistant strain of USA300 “is presently rare” in the general population, according to the study, and there is reason to believe it is spreading “exclusively” among gay men-but that does not mean that it is exclusive to gay men.

When dealing with such a socio-politically charged topic, reporters must emphasize (as Lawrence Altman did in The New York Times’s first article on the subject last week) that even though the infection is prominent among gay men, it has occurred among non-gays as well (hospital workers in particular), and that it is not a sexually transmitted disease. Homosexual intercourse, in other words, is an important risk factor (in a couple cities at least), but not the root of infection.

If you'd like to get email from CJR writers and editors, add your email address to our newsletter roll and we'll be in touch.

Curtis Brainard writes on science and environment reporting. Follow him on Twitter @cbrainard.