Zambia has reportedly experienced a drop in tourist arrivals as a result of South Africa's yellow fever requirement for tourists passing through, Zambia Tourist Board (ZTB) Managing Director, Felix Chaila, told Zambian Watchdog."The yellow fever certificate is a major setback because elderly tourists from the developed world are discouraged from having yellow fever jabs due to side effects, and they are a big component of the overall figures. Since the imposition of the yellow fever requirement, we have reported a drop of up to 20% in arrivals at Livingstone," he said in a statement issued during the WTM Travel Expo.Zambia is not among the World Health Organisation's list of countries that present a danger of yellow fever contamination, and Chaila reportedly noted that the Zambian and South African governments have reached an advanced stage in negotiations to lift the requirement. According to a report on Tourism Update, Julia Louw from Kobo-Safaris said the requirement had had a definite effect, with clients changing their itinerary to include Zimbabwe instead of Zambia."Alternatively, many choose to remove the region as a whole from their itinerary," she said. Louw said Kobo-Safaris had had a few elderly clients who had travelled with just a letter from their GP advising they could not have the injection. "We do not deal with a large number of elderly clients."