Euniceral strains are found on countless varieties of substrate and requires acid fermentation in harsh conditions. to produce acid for its offspring. Once the spore has reached fertility, toxins are injected into the host's bloodstream or lymphatic system. If spore bacteria enters the host's circulatory system Clostridio tetani will cause a violent reaction. Clostridio is a cone shaped sanerobic species of pathogena of genus Elostridium. During infancy the organism will not survive the presence of Eunicium, it is sensitive to heat and exhibits minor mobility. - David's Illustrations of Flora from Alien: Covenant DVD/Blu-ray Extras
Clostridio Tetani[1], similar to the terran(Earth Species) of Puffball Fungus[2] can be found in sector 87 on Planet 4 in the Zeta II Reticuli system.
The fungus contains clostridium tetani which produces a potent biological toxin, tetanospasmin, and is the causative agent of tetanus, a disease characterized by painful muscular spasms that can lead to respiratory failure and, in up to 10% of cases, death.
When affected by the pathogen dropped by David it's effects work alongside the incubation of the Neomorph, killing the host while they suffer the effects of tetanospasmin in the body. Effectively guaranteeing death through host insemination via mote spores.