Which of the following is not a cause of infectious myocarditis?

Infectious myocarditis is primarily caused by various infectious agents, including viruses, bacteria, and parasites. The correct answer is based on the understanding that vitamin deficiencies do not directly cause infectious myocarditis. Instead, they can lead to various health issues, but they do not introduce infectious pathogens that lead to myocarditis.

HIV, for instance, is known to compromise the immune system and can lead to opportunistic infections that may cause myocarditis. Similarly, Lyme disease, caused by the Borrelia bacterium transmitted through tick bites, can lead to myocarditis as a complication of the infection. Tuberculosis, primarily affecting the lungs, can disseminate and also infect the heart muscle, leading to myocarditis.

In contrast, vitamin deficiencies, while critical to overall health, do not result in infections or inflammatory conditions within the myocardium. Therefore, they are not considered a cause of infectious myocarditis, making this option the correct answer to the question.