Some parasites have the power to radically alter their hosts' appearance and behaviour. The hosts essentially transform into parasite-controlled zombies.
By starting signalling processes in both cells, host-parasite interactions aid in the spread of the infection. This step in understanding microbial pathogenicity involves interactions between the pathogen and the host cell surface. The relationship between two species of plants or animals known as "parasitism" occurs when one species gains an advantage over the other, sometimes without really harming the host organism.
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