Equine Rhodococcosis is an infectious disease caused by Rhodococcus equi, which generates chronic pneumonia and lung abscess in horses, especially in foals under 6 months of age, it is a gram positive bacterium that has the facility to develop in summer. And as a consequence of a high contamination of the grass, affecting the lung tissue and can also compromise the intestines. This pathology not only affects the animals mentioned above, but can also carry out its infection in humans, although it is rare. But studies carried out show that this microorganism is capable of affecting humans, especially immunocompromised patients with diseases such as HIV, patients who have undergone organ transplants and those who receive immunosuppressive therapies, for these reasons it is said that Rhodococcus equi, is an opportunistic microorganism in humans.