EMMA FARGE and KATE KELLAND SOME 120 million rapid diagnostic tests for coronavirus will be made available to low- and middle-income countries at a maximum of $5 each, the World Health Organization (WHO) has announced.  The wider availability of quick, reliable and inexpensive testing will help 133 countries to track infections and contain the spread, closing the gap with wealthy ones, it said. WHO Director-General Tedros Adhanom Ghebreyesus said the manufacturers Abbott and SD Biosensor had agreed with the Bill & Melinda Gates Foundation to "make 120 million of these new, highly portable and easy-to-use rapid COVID-19 diagnostic tests available…