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Medieval plague outbreaks in England picked up frightening speed in the 17th century, Canadian researchers report.

Their analysis of historical documents covering 300 years showed that outbreaks of the plague doubled every 11 days in London during the 1600s, compared to every 43 days in the 14th century.

"It is an astounding difference in how fast plague epidemics grew," sai...

A coronavirus strain that has plagued the swine industry in recent years may have the ability to spread to people, researchers say.

Swine acute diarrhea syndrome coronavirus (SADS-CoV) has infected swine herds throughout China since its discovery in 2016, according to a new report.

In lab tests, scientists at the University of North Carolina (UNC) at Chapel Hill showed that ...

Three weeks after becoming the first big urban area to reopen public schools since the pandemic began, New York City is not seeing a feared surge in cases among students and staff.

Instead, health officials are seeing a surprisingly small number of COVID-19 cases, The New York Times reported.

Of 15,111 staff members and students tested randomly in the first wee...

The number of new U.S. coronavirus cases topped 60,000 on Thursday, a tally not reported since early August, as health experts worried the coming winter might push the toll even higher.

The latest numbers have also sent the country's total COVID-19 case count past 8 million, the The New York Times reported.

The surge is nationwide, with cases multiplying across the co...

In what will come as reassuring news to those who were born with a heart defect, new research finds these people aren't at increased risk for moderate or severe COVID-19.

The study included more than 7,000 adults and children who were born with a heart defect (congenital heart disease) and followed by researchers at Columbia University Vagelos College of Physicians and Surgeons, in Ne...

The nation's top infectious diseases expert warned Wednesday that Americans need to consider canceling family gatherings for Thanksgiving because coronavirus cases are now surging in 37 states.

Dr. Anthony Fauci told CBS News that those surges might worsen if families across the country travel and gather for the beloved holiday.

"That is unfortunately a risk, when you...

There's more evidence that blood type may affect a person's risk for COVID-19 and severe illness from the disease.

The findings are reported in a pair of studies published Oct. 14 in the journal Blood Advances.

In one, researchers compared more than 473,000 people in Denmark with COVID-19 to more than 2.2 million people in the general population.

Among the C...

Coronavirus outbreaks in the Midwest and Western United States have driven the national case count to its highest level since August, fueling fears of what the coming winter will mean for the country.

COVID-19 cases are starting to climb in 36 states, including parts of the Northeast, which is starting to backslide after months of progress, The New York Times reported. More tha...

In some reassuring news on the coronavirus front, a new study finds that pregnant women with COVID-19 rarely infect their newborn.

That finding suggests that it may not be necessary to separate infected mothers from their infants and that moms can continue to breastfeed, the researchers added.

"Our findings should reassure expectant mothers with COVID-19 that basic infectio...

A study to assess whether certain approved or experimental drugs are effective against COVID-19 and warrant testing in large clinical trials has been launched by the U.S. National Institutes of Health (NIH).

The research will largely focus on monoclonal antibody medications. These types of drugs garnered headlines last week as President Donald Trump credited one such drug cocktail, ma...

Bedside tests for COVID-19 may speed results and improve infection control, making them better than standard laboratory tests, a new study suggests.

Results of the bedside test take about 2 hours, compared with 21 hours for PCR lab tests, the researchers said. These findings are from more than 1,000 British hospital patients tested with the QIAstat-Dx POCT test.

Reducing t...

A pair of new studies assert that the U.S. response to the COVID-19 pandemic has been a disaster, causing more deaths than thought and prolonging Americans' suffering more than any other country.

The United States experienced a 20% increase over expected deaths between March and August 2020, with more than 225,500 people needlessly dying, said the lead researcher on the first stud...

After a serious case of COVID-19 you may have long-lasting immunity, a new study finds.

The finding is reassuring to patients because the immune system makes antibodies in response to SARS-CoV-2, the virus that causes COVID-19, the researchers said.

"But there is a big knowledge gap in terms of how long these antibody responses last," said researcher Dr. Richelle Charles o...

A second coronavirus vaccine trial was paused on Monday after an unexplained illness surfaced in one of the trial's volunteers.

Johnson & Johnson, which only began a phase 3 trial of its vaccine last month, did not offer any more details on the illness and did not say whether the sick participant had received the vaccine or a placebo. The trial pause was first reported by the heal...

Hours after President Donald Trump held a rally on the White House lawn for hundreds of supporters, his doctor said he is "no longer considered a transmission risk to others."

In a memo released Saturday night, White House physician Dr. Sean Conley said he was sharing information about the status of Trump's coronavirus infection with permission from Trump, ...

COVID-19 symptoms can last a long time in pregnant women, researchers say.

The new study included 594 pregnant women (average age 31) across the United States who tested positive for the new coronavirus but were not hospitalized. Nearly one-third were health care workers.

On average, the women were about 24 weeks' pregnant when they joined the study.

The most comm...

Even as the nation's top infectious diseases expert said Friday that the White House experienced a "superspreader" event in the Rose Garden last month, President Donald Trump announced he will hold his first public event at the White House since testing positive for the coronavirus a week ago.

The Saturday event, which will have Trump speaking from a balcony to a crowd of supporters o...

The truly scary thing about Halloween this year is that it's occurring during a pandemic, but there are safe ways to celebrate, the American Academy of Pediatrics (AAP) says.

Suggestions include: virtual costume parties; physically distant, outdoor costume parades; Halloween-themed craft making; movie nights at home; decorating pumpkins; and making favorite treats.

"Many kid...

COVID-19 is primarily a respiratory infection, but experts have suspected the virus can also infiltrate the eyes. Now, scientists have more direct evidence of it.

The findings are based on a patient in China who developed an acute glaucoma attack soon after recovering from COVID-19. Her doctors had to perform surgery to treat the condition, and tests of her eye tissue showed evidence ...

The new coronavirus is striking the Upper Midwest with a vengeance, as Wisconsin and the Dakotas became COVID-19 hotspots and health officials scrambled for hospital beds on Thursday.

After months where residents of those states downplayed the virus and rejected mask requirements, all three now lead all other states in new cases per capita, the Associated Press reported.

...

The Zika epidemic, which began as a mosquito-borne viral infection and led to severe birth defects, affected far more people than previously thought, new research shows.

For the study, researchers analyzed data from 15 countries and territories in South America, Central America and the Caribbean with a combined population of 507 million, and concluded that they had over 132 million Zi...

Regeneron Pharmaceuticals Inc. said Wednesday that it is seeking emergency approval from the U.S. Food and Drug Administration for an experimental antibody cocktail given to President Donald Trump shortly after he was diagnosed with COVID-19.

Hours before the company made the announcement, Trump proclaimed in a video released by the White House that the drug had an "unbelievable" effe...

More than two dozen types of animals that are often in close contact with people may be at risk of coronavirus infection, a new study suggests.

This could threaten some endangered species and harm certain types of farms. In addition, some animals may act as reservoirs for human reinfection, according to the researchers at University College London (UCL).

For the study, the i...

Following weeks of delay, the White House on Tuesday approved tough new rules for coronavirus vaccine developers that will make it unlikely that a vaccine will be approved before Election Day.

The approval came only after the U.S. Food and Drug Administration published the updated guidelines on its website as part of briefing materials for outside vaccine advisers, the Washington P...

After being treated for COVID-19 at Walter Reed National Military Medical Center for three days, President Donald Trump returned to the White House on Monday evening.

Once he was discharged from the hospital, Trump flew in the Marine One helicopter to the White House lawn. He then climbed the steps to the White House entrance, removed his face mask and gave a thumbs up to reporters.

Hospitalized COVID-19 patients face an increased risk of developing dangerous blood clots, a new review indicates.

The odds of a clot are highest for the most critically ill patients. Analysis of 66 studies found that 23% of COVID-19 patients in an intensive care unit (ICU) developed a blood clot in the leg, known as a deep vein thrombosis (DVT).

Overall prevalence of ...

Wearing a face mask cannot lead to carbon dioxide poisoning, even in people with lung disease, researchers report.

The findings counter claims that wearing face masks to prevent spread of the new coronavirus may put some people's health at risk.

The authors of the new study assessed changes in oxygen or carbon dioxide levels in healthy people as well as in those with chronic...

After being treated for COVID-19 at Walter Reed National Military Medical Center for three days, President Donald Trump was released from the hospital Monday evening.

Earlier in the day, he tweeted about his impending discharge, saying, "I will be leaving the great Walter Reed Medical Center today at 6:30 P.M. Feeling really good! …"

Trump's medical team delivered an ...

As President Donald Trump battles the coronavirus, researchers reveal concerning new findings: Neurological symptoms occur in 8 of 10 hospitalized COVID-19 patients.

These symptoms include muscle pain, headaches, dizziness, encephalopathy and "brain fog."

"Encephalopathy, which is characterized by altered mental function ranging from mild confusion to coma, is the most sever...

President Donald Trump's doctors delivered an update of his condition on Sunday that suggested he might have more than just a mild case of COVID-19.

Based on the doctors' accounts, Trump's symptoms quickly escalated after he announced early Friday morning that he had tested positive for the coronavirus, The New York Times reported. He was taken to Walter Reed National Military ...

SATURDAY, Oct. 3, 2020 (HealthDay News) -- President Donald Trump was being treated for coronavirus infection at Walter Reed National Military Medical Center on Saturday, after announcing that he had tested positive for COVID-19 early Friday morning.

Trump is struggling with a fever, a cough and nasal congestion, among other symptoms, two officials familiar with his condition told th...

Shortly after President Donald Trump announced on Friday that he and his wife, Melania, have been diagnosed with COVID-19, Democratic presidential candidate Joe Biden said that he and his wife, Jill, have tested negative for the coronavirus.

Both Bidens had attended Tuesday's presidential debate between Trump and Biden, the Washington Post reported.

"I'm happy to repo...

Age, weight and gender are three risk factors for severe COVID-19 illness that could complicate President Donald Trump's coronavirus infection, medical experts said Friday.

Trump announced in a 1 a.m. tweet Friday that both he and his wife, Melania Trump, had tested positive for the novel coronavirus, shortly after close advisor Hope Hicks tested positive.

Trump is 74 years ...

FRIDAY, Oct. 2, 2020 (HealthDay News) -- President Donald Trump announced early Friday morning that he and his wife, Melania Trump, have tested positive for the coronavirus.

In a tweet sent out at 1 a.m., Trump said they will both quarantine in the White House for an unspecified period of time, The New York Times reported. The diagnosis forces him to temporarily withdraw from...

Ordinary conversation releases airborne droplets that can spread widely through indoor spaces, a finding with big implications for transmission of the new coronavirus, researchers say.

Their experiments showed that everyday talk can expel droplets farther than the typical "social distancing" limit of 6 feet.

"People should recognize that they have an effect around them," sai...

Antibodies against COVID-19 in people who've recovered from the disease begin to vanish about three months after they develop symptoms, researchers say.

This suggests that sooner is better for recovered COVID-19 patients to donate antibody-containing blood plasma for convalescent plasma treatment, according to the authors of a small study published Oct. 1 in the journal Blood.<...

Doctors stress that it's a very rare occurrence, but one woman's pre-surgery COVID-19 nasal swab test appears to have triggered a release of cerebrospinal fluid into her upper nasal cavities.

The incident was tied to a tiny gap in the bones of the woman's skull -- an encephalocele.

"The [COVID-19 test] swab itself did not result in a violation of the bony skull base, but rat...

Coronavirus infections are surging in the American heartland, with Wisconsin bearing the brunt of COVID-19's relentless spread.

Many Midwestern states are seeing some of the nation's highest per capita rates of infection, and while federal health officials have again urged some governors in the region to require masks statewide, some Republican governors have resisted, the Associat...

Using your body as a canvas for tattoos might come at a price for your health.

New research suggests that all that ink impedes natural sweating -- and that might cause the body to overheat.

The study found that tattooed skin on arms "has reduced sweat rates, and thus potential heat loss capacity, during [whole-body heating], compared to adjacent skin without tattoos."

...

More than 60% of households with children in the United States have struggled with serious financial problems during the coronavirus pandemic, a new poll shows.

Black and Hispanic households with children have borne the brunt of the hardships, which include struggles to afford medical care, depletion of household savings and difficulty paying debts, the poll found.

Cond...

One of the big questions around any new COVID-19 vaccine is: Will it safely protect those at highest risk from the illness -- older people?

Now, the results of an early phase 1 trial in 40 adults over the age of 55 suggests that one vaccine, under development by drugmaker Moderna, elicits an immune system response that's equal to that seen in younger recipients.

As well, vac...

TUESDAY, Sept. 29, 2020 (Healthday News) -- The global coronavirus pandemic reached a grim new milestone on Tuesday: One million dead.

Americans made up more than 200,000 of those deaths, or one in every five, according to a running tally comprised by Johns Hopkins University.

"It's not just a number. It's human beings. It's people we love," Dr. Howard Markel, a professor of...

MONDAY, Sept. 28, 2020 (Healthday News) -- Less than 10 percent of Americans have antibodies to COVID-19 in their systems, a new U.S. study finds.

The percentages varied by region -- averaging 3.5% in the West to 27% in the Northeast, according to researchers at Stanford University. They put the national average of Americans with antibodies to SARS-CoV-2 at 9.3%.

Babies born to mothers with COVID-19 only rarely suffer from effects of the virus, a new study suggests.

These newborns generally do well in the six to eight weeks after birth, but more are admitted to the neonatal intensive care unit (NICU) if their mothers had COVID-19 in the two weeks before delivery.

Of more than 200 babies studied, complications including preterm birt...

Low blood levels of vitamin D might heighten people's odds for severe or even fatal COVID-19, new research shows.

Taking in a healthy level of vitamin D may therefore "reduce the complications, including the cytokine storm [release of too many proteins into the blood too quickly] and ultimately death from COVID-19," said study author Dr. Michael Holick. He's a professor of medicine, p...

Combined data from 32 studies from around the world suggest that children under the age of 10 are much less likely to become infected with SARS-CoV-2 compared with adults, given the same daily contacts.

Children's risk appears to rise with age: Among adolescent and older teenagers, the risk of infection begins to approach that of adults, according to British researchers led by Russel...

FRIDAY, Sept. 25, 2020 (Healthday News) -- The number of U.S. coronavirus cases passed 7 million on Friday, with California the hardest hit state so far in a pandemic that has crippled the country for more than six months.

The United States has been averaging about 41,500 cases daily, down from the pandemic's midsummer peak, but states in the Midwest and West are seeing case numbers c...

People who have COVID-19 but no symptoms have the same amount of virus in their nose and throat as those with symptoms and may play a major role in spreading the disease, a new study reveals.

The researchers compared levels of SARS-CoV-2 in 213 people in South Korea who tested positive for the virus.

Their symptoms ranged from none to severe, including fever, chills, muscle...

THURSDAY, Sept. 24, 2020 (Healthday News) -- The head of the U.S. Centers for Disease Control and Prevention told a Senate committee on Wednesday that 90% of Americans are still at risk of contracting the virus.

"The preliminary results in the first round [of a very large, ongoing CDC study] show that a majority of our nation, more than 90% of the population, remains susceptib...

Young athletes who've had moderate COVID-19 symptoms should be symptom-free for 14 days and get their doctor's OK before returning to practices or games, according to a leading group of U.S. pediatricians.

An electrocardiogram (EKG) is also recommended for those who've had moderate COVID-19 symptoms, the American Academy of Pediatrics (AAP) said in updated guidance.

"Exercis...