"The ability to test possible cases has only ramped up in the last few months, so many people who ought to have been tested were not tested," one expert told Newsweek.
A World Health Organization representative also warned that the virus may "come back again."
Scientists studied gut cells in a lab to explore their role in coronavirus infections.
The unexplained multi-system inflammatory syndrome has also been reported in children in the U.K..
Scientists studied the blood of over a dozen COVID-19 patients.
The team hopes their findings could aid the development of specific treatments for COVID-19.
Scientists used a mathematical model to map how the body interacts with the coronavirus.
Airlines are following face-covering recommendations by the U.S. Centers for Disease Control and Prevention.
There are currently no specific drugs to treat COVID-19, the disease caused by the novel coronavirus.
"The fate of vaccine trials has several hurdles to cross and nothing is guaranteed, but that should not stop us from trying," Sanjay Mishra of Vanderbilt University Medical Center told Newsweek.
"We must be prepared for at least another 18 to 24 months of significant COVID-19 activity, with hot spots popping up periodically in diverse geographic areas," the CIDRAP report read.
The drugs should only be used to treat patients taking part in carefully designed clinical trials, according to the authors of the review published in FASEB Journal.
Marissa Baker of the University of Washington School of Public Health said: "Our findings serve as an important reminder that the workplace should be a focus for public health intervention, especially during disease outbreaks such as COVID-19."
The drug blocks the virus from entering cells in the airways.
Study co-author Dr. Ting Ma of the Harbin Institute of Technology said the study "may demonstrate the huge scale of testing and contact tracing that's needed to reduce the virus spreading."
"Only by working together in solidarity and led by science can we end the #COVID19 pandemic," the World Health Organization's director-general wrote on Twitter Wednesday morning.
There is currently no vaccine to prevent COVID-19.
Professor Jenny Graves of Australia's La Trobe University believes a combination of genes, hormones, behavior, and the immune system may make men more susceptible to the disease.
Patricia Dowd, 57, died on February 6.
Scientists studied data on over 2,000 people to explore the potential link between gut microbes and the disease caused by the coronavirus.
The World Health Organization's director-general noted that many countries could have implemented procedures to mitigate the coronavirus' spread much earlier, per the recommendations outlined in its January 30 public health emergency declaration.
Professor Brendan Wren of the London School of Hygiene and Tropical Medicine told Newsweek the varying levels of severity people experience with the virus may partly be down to differences in individuals' immune systems.
Experts stressed that most children have a mild case of COVID-19.
Researchers in Italy first reported skin problems as a potential COVID-19 symptom in March.
The UN agency says there is a danger that those who have recovered from COVID-19 might ignore public health advice.
The figure best-suited to understanding the virus is the infection fatality rate, or the percentage of people who die after catching the coronavirus.
The study involved patients treated at a dedicated COVID-19 hospital in China.
Trump halted funding on April 14, citing the agency's criticism to his travel ban and its statements in January that said COVID-19 did not spread through human-to-human contact.
Pet owners with COVID-19 should avoid "petting, snuggling, being kissed or licked, and sharing food or bedding" with their animals, the USDA said.