As COVID-19 spread around the world, health organizations, governments and disease experts encouraged frequent and vigorous hand washing to protect against the coronavirus infection. Demand shot up for antibacterial soaps, sanitizers and disinfectants. But some have raised concerns about the possible negative effects of that preventative action — particularly skin irritation and sensitivity, as well as developing a resistance to antibacterial products. Fulton Schools Professor Rolf Halden, an environmental health engineer, points to risks posed by some antimicrobial chemicals used in disinfectants, cleaning and personal care products that could do harm to people and the environment.