MILWAUKEE, Wis. (SPECTRUM NEWS) - Another day, another clarification from the World Health Organization this week about how COVID-19 could be spreading.

"I think where we stand is that we've gotten some preliminary results and some confusion on what's considered asymptomatic and pre-symptomatic," Dr. Laura Cassidy, an epidemiologist with the Wisconsin Medical College told Spectrum News 1. "[These] were the interpretations of a couple small studies."

Monday, Maria Van Kerkhove with the WHO, said that it's rare "that an asymptomatic person (who likely has no symptoms and likely no idea he or she has the virus) actually transmits [COVID-19] onward to a secondary individual."

Tuesday, she clarified those remarks, indicating more research needs to be done and that the WHO knows "that some people who are asymptomatic, or some people who don't have symptoms, can transmit the virus on."

"Studies are coming out so quickly and we're trying to get information out and how we interpret them needs to be examined," Dr. Cassidy said.

Now months after the worldwide pandemic began and as researchers learn more information about the virus into the summer, Dr. Cassidy says it's clear that certain preventative measures help to protect people from COVID-19.

"Keep wearing masks, keep social distancing, keep washing hands, and be diligent about cleaning high-touch surfaces and disinfecting them," she said. "That is the one thing we know that works."

Watch the entire interview above.