Countries including South Africa and Trinidad and Tobago have confirmed their first cases of Zika virus.
More than 5,000 pregnant women in Colombia have contracted the virus, its government has said.
Brazil's President led a nationwide campaign to educate people in how they can help in the fight against Zika today, by visiting homes and sharing tips on how to deter virus carrying mosquitoes with the public.
President Dilma Rousseff, cabinet ministers, and as many as 220,000 troops all went door to door on the so-called National Day for "Zero Zika" in a concentrated effort to raise awareness about the disease which cuurently has no vaccine or treatment.
Britain's camp for the Rio Olympics should be moved to a Zika-free location outside Brazil, Jessica Ennis-Hill's coach has said.
The mother of Zika "bucket baby" Jose Ferreira is holding out hope despite doctors' fears over his future.
The government has told airlines to take the measure on all flights travelling to the UK from countries with confirmed transmission of Zika.