Don't just sneeze without a tissue! That's the message of this early pandemic era graffiti in Dakar, Senegal. The World Health Organization has just issued an updated report on the way SARS-CoV-2 spreads. Take our quiz to see if you're up on your COVID terminology. Seyllou/AFP via Getty Images hide caption
Globally, there are more than 400 million UTIs a year. This illustration depicts the most common kind of UTI—bladder (blue) inflammation caused by E. coli (red). TUMEGGY/Getty Images/Science Photo Library hide caption
A patient infected with chikungunya looks out from mosquito netting at a hospital in San Lorenzo, Paraguay. The country has counted over 100,000 cases of the mosquito-borne virus this year. Jorge Saenz/AP hide caption
This undated photo made available by the Centers for Disease Control and Prevention shows a strain of Candida auris cultured in a petri dish. Shawn Lockhart/AP hide caption
In the video game and HBO show The Last of Us, an infectious fungi turns humans into zombies. David McNew/Getty Images hide caption
Staff volunteers queue to receive a fourth dose of the Pfizer COVID-19 vaccine at Sheba Medical Center in Israel on Dec. 27, 2021, as the hospital conducted a trial of a fourth jab of the vaccine. Jack Guez/AFP via Getty Images hide caption
There's increasing emphasis on wearing masks while flying. How much protection do they offer against COVID-19? James D. Morgan/Getty Images hide caption
Outdoor dining in Bonn, Germany. Indoor dining is riskier than outdoor meals, experts say. Outdoor air can disrupt viral particles that have been expelled. Andreas Rentz/Getty Images hide caption
Minks at a mink farm. Yuri Tutov/AFP via Getty Images hide caption
Childhood infections may increase the risk of developing certain mental illnesses in childhood and adolescence. Kathleen Finlay/Getty Images/Image Source hide caption
Sheila Dhand, a wound care nurse, treats many people who use drugs via mobile unit. Elana Gordon / WHYY hide caption