The United Nations Food and Agriculture Organization is urging farmers to be on guard against transboundary animal diseases. Officials warn that ticks, lice and other pests can spread quickly from one country to the next. Experts from across Africa say trans-border diseases kill between 10 and 20 percent of the continent's animals every year. The experts gathered in Cameroon last month to discuss the problem. They suggested large vaccination and pest eradication programs to stop the spread of the diseases. Dr. Taiga is Cameroon's livestock minister. He does not use a first name. He says pests like nose bot flies and wool maggots are harming animals in some communities in his country. Dr. Taiga says all animals in an area must be killed if one animal is affected because the diseases are contagious. They spread quickly from animal to animal. He says that is why the Food and Agriculture Organization (FAO) and the World Organization for Animal Health are working together to destroy the diseases. He says that when central African countries succeed in killing the pests, their human populations will enjoy better quality protein. Sebastien Mongomo is an animal pest expert from Equatorial Guinea. He told the conference that diseases caused by pests have killed at least 10 percent of the sheep and goats in his country this year. Dr. Mongomo says the borders between Cameroon, Gabon and Equatorial Guinea are largely unguarded. He notes it is difficult to control the movement of animals. Pests can spread diseases and also cause health problems known as secondary infections. Some infections cause the animals to become very tired. They may not eat. Then they die. Dr. Felix Njemi is an animal health officer at the FAO. He says the large number of animal deaths is worsening the food crisis in Africa, especially in countries south of the Sahara. "The strategy is the large vaccination at the country level. Undertake surveillance to detect any case of the disease and strengthen collaboration between member nations and even between international institutions. Imagine somebody who has 10 animals and loses eight. The disease can have impact in food security."Many poor people in African countries depend on goats and sheep for their livelihoods. The FAO says people become vulnerable to famine when pests attack and kill their animals.