As COVID-19 swept the globe, misinformation spread just as rapidly, sowing panic and confusion. To cut through the noise, infectious disease specialists and epidemiologists at UTHealth Houston share evidence-based insights on prevalent myths.
Myth: Vitamin C fights off the virus
Vitamin C supports immune health through fruits and vegetables, but studies show it offers little protection against the common cold—and even less against COVID-19.
“Research indicates vitamin C provides no significant benefit in preventing or treating the common cold in most patients, and COVID-19 isn't a cold,” explains Joyce Samuel, MD, associate professor of pediatrics at McGovern Medical School.
Susan Wootton, MD, associate professor of pediatrics and pediatric infectious disease specialist at UTHealth, adds, “No data supports extra vitamin C against COVID-19. Our bodies absorb only so much; excess is simply excreted, offering no added benefit.”
Myth: The virus dies out in warmer weather
Unlike seasonal flu, it's unclear if COVID-19 will fade with rising temperatures. “This novel virus leaves us uncertain,” notes Catherine Troisi, PhD, epidemiologist and associate professor at UTHealth School of Public Health. “Warmer weather may help, but summer breaks from school likely play a bigger role in reducing transmission.”
Myth: Drinking water every 15 minutes flushes out the virus
Staying hydrated aids recovery, but no evidence shows frequent water intake prevents COVID-19. “There's zero data for this,” says Wootton. Luis Ostrosky, MD, professor of internal medicine and infectious disease expert at McGovern Medical School, cautions against gargling warm water as a preventive measure.
Myth: Masks protect everyone from COVID-19
Masks are vital for healthcare workers treating patients and for those who are ill. “Healthy people or non-frontline staff gain little benefit,” states Michael Chang, MD, assistant professor of pediatrics and infectious disease specialist at McGovern Medical School. “Masks can foster overconfidence, leading to skipped handwashing or more face-touching. Reserve them for those who truly need them.”
Myth: COVID-19 could mutate into a deadlier strain
Viruses evolve, but mutations often weaken them. “Mutations aren't inherently bad—many are neutral or reduce virulence, like in live vaccines,” Chang explains. “A deadlier COVID-19 strain is highly unlikely.”
Myth: Hot water washes away germs better than cold
Handwashing with soap and water is key to curbing spread, per CDC guidelines—water temperature doesn't matter. “It's the scrubbing that cleans, not heat,” says Chang. “Use warm or cold water, scrub for at least 20 seconds, and dry thoroughly.”
