Dr. Kevin De Cock, whose distinguished career includes director of CDC Kenya and director of WHO HIV/AIDS, with Emerging Infectious Diseases Editor-in-Chief Dr. Peter Drotman, and Sarah Gregory discuss the history of HIV/AIDS, and what we've learned along the past 40 years.

Dr. Mateusz Markowicz, a researcher at the Medical University of Vienna in Austria, and Sarah Gregory discuss the risk of tickborne infections after a tick bite.

Dr. Ria Ghai, an associate service fellow at CDC, and Sarah Gregory discuss how animals can serve as hosts for alpha- and betacoronaviruses.

Dr. Ron Louie, a clinical professor in Pediatrics Hematology-Oncology at the University of Washington in Seattle, and Sarah Gregory discuss his poem, "Isolation Cocoon, May 2020-After Zhuangzi's Butterfly Dream," which was inspired by the early events of the COVID pandemic.

Dr. Jennifer Cope, a medical epidemiologist at CDC, and Sarah Gregory discuss trends in recreational water exposure associated with primary amebic meningoencephalitis in the United States.

Dr. Kristen Pettrone, an Epidemic Intelligence Service officer at CDC, and Sarah Gregory discuss the characteristics of hospitalized and nonhospitalized patients with COVID-19 in Atlanta.

Dr. Stina Syrjänen, a professor and chairman emerita at the University of Turku and chief physician in the Department of Pathology at Turku University Hospital in Finland, and Sarah Gregory discuss the transmission and prevalence of oral HPV infection in children.

Dr. Kristien Van Reeth, a professor of virology at Ghent University in Belgium, and Sarah Gregory discuss a case of avian-like swine influenza in a pig farmer in the Netherlands

Dr. Adriana Cabal Rosel, a public health microbiologist at the Austrian Agency for Health and Food Safety, and Sarah Gregory discuss the use of a new surveillance system to track increased cases of Bordetella pertussis in Austria.

Dr. Amyn Malik, an epidemiologist and postdoctoral associate at Yale University, and Sarah Gregory discuss the use of preventive therapy for at-home exposure to drug-resistant TB.