isochronism:
Almost all heart issues related to Covid-19 in kids resolve completely within six months, easily verified by searches on the subject.
Preventable heart disease (the type of heart disease that can be avoided with lifestyle changes) is increasing among children. This increase is largely believed to be due to a rise in childhood obesity, which is a known risk factor for preventable heart disease.
It is highly unlikely that the Marburg Virus will cause anything near a pandemic due to the method of human to human transmission being like this per the WHO:
’’Marburg spreads through human-to-human transmission via direct contact (through broken skin or mucous membranes) with the blood, secretions, organs or other bodily fluids of infected people, and with surfaces and materials (e.g. bedding, clothing) contaminated with these fluids."