A third mutant strain of Covid-19 was detected in Brazil this week. The Brazil variant was discovered by Japanese scientists from samples taken from four travellers from the South American country.
Coming in the month after variants from the UK and South Africa came to the world's attention, there are concerns the South American strain could also be more infectious than previous versions of the novel coronavirus.
While the latest strain is new and scientists haven't had time to study it in any great detail yet, its discovery is the latest alarming update regarding a disease which has now killed almost two million people worldwide.