Marco is about to enter a crowded indoor market and is worried about catching a respiratory virus spread by droplets and aerosols. Which of the following would do the MOST to reduce his immediate risk?

Lena cleans her pet rabbit's cage daily and sometimes inhales dust from the bedding. Her behavior most directly increases her risk for

Which of the following lists a key driver of multidrug-resistant organisms (MDROs) and the most appropriate personal action to slow their spread?

In a community outbreak, 8% of adults without young children became infected while 48% of parents of young children became infected. Calculate the relative risk (RR) of infection for parents compared to non-parents and interpret its meaning.

In the 1950s, many pneumonia patients were treated with the new antibiotic penicillin and showed initial improvement, but after a few weeks, they relapsed with infections that no longer responded to the drug. What is the most probable cause of this occurrence?