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The most common causative agent of acute endocarditis is ______.


A) Staphylococcus aureus
B) Streptococcus pneumoniae
C) Neisseria gonorrhoeae
D) Epstein-Barr virus
E) Streptococcus pyogenes

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Endocarditis is often a consequence of bacteria attached to the heart valves. These microbes are not eliminated by circulating lymphocytes because _______.


A) Gram-positive microbes don't have an exotoxin surface molecule to trigger an immune response
B) lymphocytes do not circulate through the heart valves to detect the presence of microbes
C) lymphocytes cannot engulf microbes attached to tissue
D) these microbes become covered in platelets and fibrin which is not recognized as foreign by the immune system

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Rabbits and rodents are the chief reservoirs of the causative agent of ______.


A) Lyme disease
B) plague
C) brucellosis
D) mononucleosis
E) tularemia

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The cardiovascular system is highly protected from microbial infection because _______.


A) failure to do so will result in a systemic infection
B) it is the only body system that has no normal microbiota
C) it is the only body system that is liquid-based, i.e., with blood
D) it is so close to the skin that even minor injuries could lead to major infection

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Pasteurization of milk helps to prevent _______.


A) endocarditis
B) mononucleosis
C) tularemia
D) plague
E) brucellosis

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