What I understand from the Turkish press is that the ticks already existed - and that leaving their mouthparts in when you removed them could cause a nasty infection - but that the new threat was that a tick-borne disease, Crimea-Congo haemorrhagic fever, was now spreading in Turkey, which the ticks could pass on by biting you, or from their body fluids if you squashed them. Thus the need for extra caution. So if a tick or a snake bites you, you'd better ask it if it wouldn't mind coming along to the doctor with you so they can identify it. Get the ticks to bite the snakes... Cicadas, as far as I know, don't spread any human disease, unless it's deafness...