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<p>their survival, evading host immune systems by producing <a href="page.php?w=microbial_toxin">microbial toxin</a>s and causing <a href="page.php?w=immunosuppression">immunosuppression</a>. <a href="page.php?w=Optimal_virulence">Optimal virulence</a> describes a theorized equilibrium between a pathogen spreading to additional hosts to parasitize resources, while lowering their virulence to keep hosts living for <a href="page.php?w=vertical_transmission">vertical transmission</a> to their offspring.</p>

<p><big>Types</big></p>
<p><big> Algae </big></p>
<p>Algae</p><p>
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