Love Is in the Air

And so are STDs.

Well, not the air so much as … other places … but anyway. It’s that time of year again. My personal anecdotal experience is that testing for STDs tends to spike in late winter/early spring (Thanks, Valentine’s Day and Spring Break). Several STDs can make your Valentine’s Day one to remember, though the big three in this country are gonorrhea, Chlamydia, and syphilis. The incidence of these STDs are rising, and the biggest demographic for infections are 15-24 year-olds. (If you want to read the full CDC surveillance report in all its glory, it’s here. Make some popcorn. It’s long.)

What does all of these mean for laboratory professionals? Microbiologists need to be aware that Neisseria gonorrheoeae can grow on blood agar, albeit not as well as it does on chocolate or Thayer-Martin. On blood agar, the colonies are grayish to white and more opaque than those on chocolate agar. The gram stain shows gram-negative diplococci, but as always, a gram stain result should be considered presumptive until confirmed by culture or molecular tests. Laboratories should be aware of their patient demographics; if your lab serves a large population of teenagers and young adults, you might see an influx of specimens.


Kelly Swails, MT(ASCP), is a laboratory professional, recovering microbiologist, and web editor for Lab Medicine.

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