TRAVELLERS planning to visit African, West Indian and South American countries, endemic to yellow fevers may have to postpone their plans, since the Government authorised centres in the city to administer the yellow fever vaccines are running out of stock. The vaccination is mandatory to visit the yellow fever endemic 33 countries in Africa, 11 countries in South America and a few in the West indies. The centres, Port Health Office on Rajaji Salai near Parrys Corner and King Institute in Guindy, that can give the vaccination certificate, have gone dry.