Answer from Dr Merkl:
Pfeiffer's glandular fever, a disease caused by the Epstein-Barr virus with very different courses, can also affect the kidneys, heart muscle and lungs. In many cases, medicine recognises courses lasting weeks or months, which lead to significant states of exhaustion even with slight physical exertion. The symptoms can manifest themselves over a long period of time despite normal blood values. If myocarditis in particular has been ruled out, you can start training at low intensity in the regenerative and basic endurance range. You should only increase the load slowly. Your pulse rate should not exceed a maximum value of 180 beats minus your age. High doses of vitamin C and vitamin E in combination with the trace elements copper and zinc can support the ability to regenerate, while carnitine can strengthen the immune system.
