Scientists contend a investigate involving profound women in Brazil “strengthens” a speculation that Zika is related to microcephaly birth defects in babies.
The investigate reliable a participation of Zika pathogen in a amniotic liquid of dual women who had had Zika-like symptoms during their pregnancies.
Brazilian experts contend this suggests a pathogen can taint a foetus.
But WHO experts counsel a couple is not proven and design to recover some-more information in a subsequent few weeks.
Brazil has seen a arise in microcephaly – babies innate with abnormally tiny heads and, in some cases, problems with mind growth – in a final year, during a same time as a arise in a series of people putrescent with Zika virus.
This has led to a series of studies questioning either a pathogen is behind a rise.
The research, published in a biography Lancet Infectious Diseases, concerned dual women who had fever, unreasonable and flesh aches during their pregnancies.
After ultrasound scans suggested their building foetuses had microcephaly, scientists ran serve amniocentesis checks.
This concerned holding a tiny representation of a amniotic liquid that surrounds a foetus in a womb.
Genetic investigate of this liquid reliable a participation of Zika pathogen – discounting identical viruses that might have been responsible.
Lead scientist, Dr Ana de Filippis, from a Oswaldo Cruz Institute in Rio de Janeiro, Brazil, said: “This investigate reports sum of a Zika pathogen being identified directly in a amniotic liquid of a lady during her pregnancy, suggesting a pathogen could cranky a placental separator and potentially taint a foetus.”
She added: “This investigate can't establish either a Zika pathogen identified in these dual cases was a means of microcephaly in a babies.
“Until we know a biological resource joining Zika to microcephaly we can't be certain that one causes a other, and serve investigate is urgently needed.”
Prof Jimmy Whitworth, during a London School of Hygiene and Tropical Medicine combined that while a investigate can't infer a link: “This investigate does strengthen a physique of justification that Zika pathogen is a means of foetal microcephaly in Brazil.”
Separately a paper suggests that a pathogen looks genetically really identical to a Zika pathogen present in French Polynesia in 2013.
But scientists contend notwithstanding flourishing research, a lot stays different and a series of questions still need obligatory answers – including how large a risk of microcephaly is if a lady has Zika pathogen infection in pregnancy and either a timing of a infection creates a difference.
Brazil, a nation hardest-hit by Zika, has about 508 reliable cases of microcephaly and is questioning about 3,935 suspected cases.
The method pronounced final week that 41 of a reliable cases of microcephaly had shown links to Zika infection.
Microcephaly can be caused by a operation of factors, including genetic conditions, infections and drugs.
Experts contend women who are profound are many during risk from mosquito-borne Zika and should try to strengthen themselves from butterfly bites.