Full size image The ms is either directly transmitted via direct contact (e.g., HIV,Treponema pallidum), droplet infection (Mycobacterium tuberculosis), contact with soil (e.g.,Ascaris, Ancylostoma, Enterobius), trans-placental (e.g.,Leishmania, Toxoplasma), food (e.g., Coccidia,Fasciola, ...