Researchers have found more evidence linking the mosquito-borne Zika virus to a neurological disorder known as Guillain-Barre syndrome, but proof of cause-and-effect remains elusive, a study said Wednesday.

The findings in the New England Journal of Medicine were based on research at six different hospitals in Colombia, involving 68 people with Guillain-Barre syndrome, most of whom had previous symptoms of Zika infection including rash, fever, headache and red eyes.

England is to train more doctors so that it can end its reliance on foreign recruits for the state-funded National Health Service after it leaves the European Union, the government announced Tuesday.

Thai health authorities said Friday that microcephaly in two babies was caused by the Zika virus, in what is believed to be Southeast Asia's first confirmed case of a link between the sickness and the birth defect.

"Two of the three infants (tested) had microcephaly due to the Zika virus," Health Ministry official Wicharn Pawan told AFP.

Thailand is testing three babies and an unborn child with microcephaly whose mothers are infected with Zika to see if the infants' condition is linked to the virus, the Public Health Ministry says.

Zika causes only mild symptoms in most, including fever, sore eyes and a rash. But pregnant women with the virus risk giving birth to babies with microcephaly -- a deformation that leads to abnormally small brains and heads.

The world's first baby has been born thanks to a controversial new technique employed by US scientists to include DNA from three parents in the embryo, said a report Tuesday.

The baby boy was born five months ago in Mexico to Jordanian parents, and is healthy and doing well, said the report in New Scientist magazine, described as an "exclusive."

At least 23 people have died after drinking moonshine in impoverished rural regions of eastern Ukraine that border on the former Soviet republic's war zone, officials said Tuesday.

Nine out of 10 people globally are breathing poor quality air, the World Health Organization said Tuesday, calling for dramatic action against pollution that is blamed for more than six million deaths a year.

Morning sickness is linked to a lower risk of miscarriage, according to research out Monday that suggests a woman's nausea and vomiting early in pregnancy may have protective effects for the fetus.

Between 50 and 80 percent of pregnant women report feeling nauseous or throwing up during their first trimester, said the findings in the Journal of the American Medical Association (JAMA) Internal Medicine.

A three-year-old boy was recovering in hospital Friday after surviving the cold alone for three days in the wolf-infested Siberian wilderness, officials said.

Polish police said Wednesday they had smashed what could be the world's largest illegal laboratory producing counterfeit Viagra-type pills and steroids during a raid near the northern city of Bydgoszcz.