Humans could become extinct if sperm counts in men continue to fall at current rates, a doctor has warned.
Researchers assessing the results of nearly 200 studies say sperm counts among men from North America, Europe, Australia, and New Zealand, seem to have halved in less than 40 years.
Some experts are sceptical of the Human Reproduction Update findings.
But lead researcher Dr Hagai...
Your risk of a second stroke or ministroke remains considerable for at least five years after the first one, a new Canadian study finds.
"We showed that, even in those survivors who had no complications at all after their stroke, their risk did not return to normal," said researcher Jodi Edwards.
Patients were still at seven times higher risk of having a second stroke one year later, and...
A Japanese woman died last year of a tick-borne disease after being bitten by a stray cat, Japan's health ministry says, in what could be the first such mammal-to-human transmission.
The unnamed woman in her 50s had been helping the apparently sick cat.
Ten days later she died of Severe Fever with Thrombocytopenia Syndrome (SFTS), which is carried by ticks.
With no tick bite detected,...
Obese patients don't need to lose weight before undergoing knee or hip replacement surgery, a new study contends.
"Severely obese patients can benefit a lot from the surgery," said study lead author Wenjun Li, an associate professor of medicine at the University of Massachusetts Medical School.
"Patients who can lose weight should, but we acknowledge many people can't, or it will take a...
A nine-year-old infected with HIV at birth has spent most of their life without needing any treatment, say doctors in South Africa.
The child, whose identity is being protected, was given a burst of treatment shortly after birth.
They have since been off drugs for eight-and-a-half years without symptoms or signs of active virus.
The family is said to be "really delighted".
Babies' diapers may hold clues to their brain development, a new study suggests.
Researchers analyzed fecal samples from dozens of 1-year-olds and assessed their thinking (cognitive) skills a year later.
The results revealed a link between certain types of microbes in the infants' feces and higher levels of brain development at age 2.
"The big story here is that we've got one group of...
Researchers have found a way to elicit powerful, HIV-blocking antibodies in cows in weeks instead of years, which may lead to an effective AIDS vaccine.
The study, published July 20 in Nature, showed that the HIV-blocking antibodies can be obtained from cows in a matter of weeks compared to the years it takes for the same process in humans.
"One approach to a preventive HIV vaccine involves...
One in three cases of dementia could be prevented if more people looked after their brain health throughout life, according to an international study in the Lancet.
It lists nine key risk factors including lack of education, hearing loss, smoking and physical inactivity.
The study is being presented at the Alzheimer's Association International Conference in London.
By 2050, 131 million...
Infants exposed to the Zika virus in the womb should have their eyes examined for possible virus-related abnormalities, according to a new report.
"All infants with potential Zika virus exposure should undergo screening eye examinations regardless of abnormalities, timing of maternal infection during pregnancy, or laboratory confirmation," said Dr. Andrea Zin and colleagues. Zin is with the...
Researchers say a herpes virus similar to the Epstein-Barr virus that infects people has been found in mountain gorillas.
The discovery may assist in the conservation of critically endangered mountain gorillas, according to scientists at the University of California, Davis.
The finding might also benefit people with the Epstein-Barr virus, they said.
Epstein-Barr -- also called human...