A spokesman said there were no indications that patients had been adversely affected.
The viral genomes were found in aquatic vertebrate hosts from the early Palaeozoic era.
El Niño and the Pacific Decadal Oscillation also lead to a build-up of toxins in shellfish.
Scientists weigh up benefits of being a 'weekend warrior' - doing all your recommended weekly exercise in one go.
Health secretary warns patients with less serious problems may not be guaranteed speedy treatment.
Scientists have identified the genes that influence the condition's development.
UK prime minister says 'great forces' of liberalism and globalisation must be defended.
Education enrolment only accounts for a small part of why women have their first babies later.
Prime minister will unveil new plans as she addresses the Charity Commission.
May's statement follows warning from the charity after two patients died waiting on hospital beds.
British Dental Association say policies for dental treatment has a knock-on effect across NHS.
Theresa May referred to a lack of mental healthcare provision in her first speech as PM.
Emergency medical charity has asked Land Rover to provide vehicles to transport patients.
Under the right conditions, a male's stressful past can be a turn on for females.
A morning sickness treatment prescribed in Canada and the US may not prevent nausea.
The president has taken a strong stance against Republicans in New England Journal of Medicine.
While brain development involves synapse pruning, the study suggests microstructural proliferation may occur.
The use of artificial intelligence is the latest initiative being thrown at the the crisis engulfing the NHS.
Signs of Ebola viral replication was detected in the lung five days after disappearing from blood.
Chemical compound developed that shuts down the disease's ability to spread.
IBTimes UK takes a look at what the future might look like for Obamacare when Trump takes office.
The number of HIV cases could increase as charities and health workers' struggle to reach drug users.
Pollution is thought to be the main cause for the link, but factors such as noise could play a role too.
The market grew by more than 30% in 2016.
Consent is presumed even if it goes against the wishes of the family.
Some 'stand-in' doctors have been in place for over three years, earning over £300,000.
Veggies, olive oil and nuts could slow-down age-related brain shrinking.
Scientists create vaccine by genetically-modifying mosquitoes to remove genes that cause infection.
Leonardo da Vinci first noticed the body part in the 1500s, but its true structure has only just been officially recognised.
Uvesterol D is being investigated by French health authorities.