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But with the advent of agriculture, T. gondii's definitive host and multiple secondary hosts found themselves living together in close proximity.

Even though Tim Wonnacott has now been presenting Bargain Hunt for three times longer than David Dickinson ever did, Dickinson is still seen as the definitive host.

Its different Vertebrate habitat, and also the fact that its Insectan definitive host is Culex and not Anopheles, differentiate it sharply from Laverania and Plasmodium.

“Evolution places immensely strong pressure on parasites to be transmitted to the definitive host,” Dr. Barber said — in this case, tiddler-eating birds — where they can mature and produce millions of eggs.

“What happened 10,000 years ago was something really quite spectacular, which is that its definitive host became incredibly abundant,” Howard says.