* Saudi authorities testing imported camels at sea ports * Suspicion that disease comes from Horn **t yet proved * Somalia is major livestock exporters to kingdom * Any Saudi ban would hurt Somali eco**my badly By Kate Kelland, Health and Science Correspondent LONDON, June 27 (Reuters) - Saudi Arabia suspects a virus that has killed hundreds of people there may have arrived in camels from the Horn of Africa, and could ban such imports until it k**ws more, the kingdom's chief scientist told Reuters. Any ban on the camel trade with the region would badly hurt the already fragile eco**my of Somalia, which is a major livestock exporter to Saudi Arabia. Tariq Madani, who heads the scientific advisory board of the Saudi health ministry command and control centre (CCC) - set up to handle the outbreak of Middle East Respiratory Syndrome or MERS - said scientists are currently testing camels at sea ports before authorities allow them in.