LONDON (AP) — Global health officials have alerted doctors to be on the lookout for a virus related to SARS but said there were no signs the disease was behaving like the respiratory syndrome that killed hundreds in 2003.

The World Health Organization announced this week that a new coronavirus had been found in a critically ill Qatari man who was being treated in London as well as in a Saudi Arabian man who died several months earlier. Genetic sequencing found the viruses in the two men to be nearly identical.