premise: However Mr Johnson said it was likely there would still be more cases and there was the possibility of a second wave in the autumn or winter. The advice was followed by news that the number of confirmed cases of swine flu in the UK has risen to 18. Health officials are trying to trace those on the same flight as a Scottish man diagnosed with swine flu on Sunday. The man, from Ayrshire - Scotland's fourth confirmed case - flew from Birmingham International to Glasgow Airport on Thursday. He is thought to have picked up the virus while in Texas, but the authorities said no other flights were affected.
hypothesis: Mr. Johnson is a health official.