Answer D: \"may infect fleas, which transmit P. aeruginosa to humans \" Yersinia pestis is transmitted by fleas and not pseudomonas aeroginosa. P. Aeroginosa is an opportunistic infection of any wound including surgical wound, patients who are immunocompromised or with cystic fibrosis are at risk for developing this. Solution Answer D: \"may infect fleas, which transmit P. aeruginosa to humans \" Yersinia pestis is transmitted by fleas and not pseudomonas aeroginosa. P. Aeroginosa is an opportunistic infection of any wound including surgical wound, patients who are immunocompromised or with cystic fibrosis are at risk for developing this..