<prompt> International ceificate for travelling is required for -PeussisYellow feverCholeraPlague  <response>: - measures designed to restrict the spread of yellow fever are specified in the International Health Regulations of WHO. - all travelling exposed to risk of yellow fever or passing through endemic zones of yellow fever must posses a valid international ceificate against yellow fever before they are allowed to enter yellow fever receptive areas. Reference : Parks textbook of preventive and social medicine, 23rd edition pg no:283 p 