Amyloids are aggregates of proteins characterised by a fibrillar morphology of 7–13 nm in diameter, a beta sheet (β-sheet) secondary structure (known as cross-β) and ability to be stained by particular dyes, such as Congo red. In the human body, amyloids have been linked to the development of various diseases. Pathogenic amyloids form when previously healthy proteins lose their normal structure and physiological functions (misfolding) and form fibrous deposits in amyloid plaques around cells which can disrupt the healthy function of tissues and organs. Such amyloids have been associated with (but not necessarily as the cause of) more than 50 human diseases, known as amyloidosis, and may play a role in some neurodegenerative diseases. Some of these diseases are mainly sporadic and only a few cases are familial. Others are only familial. Some are iatrogenic as they result from medical treatment. Prions are an infectious form of amyloids that can act as a template to convert other non-infectious forms. Amyloids may also have normal biological functions; for example, in the formation of fimbriae in some genera of bacteria, transmission of epigenetic traits in fungi, as well as pigment deposition and hormone release in humans.Amyloids have been known to arise from many different proteins. These polypeptide chains generally form β-sheet structures that aggregate into long fibers; however, identical polypeptides can fold into multiple distinct amyloid conformations.
Viral cardiomyopathy occurs when viral infections cause myocarditis with a resulting thickening of the myocardium and dilation of the ventricles. These viruses include Coxsackie B and adenovirus, echoviruses, influenza H1N1, Epstein–Barr virus, rubella (German measles virus), varicella (chickenpox virus), mumps, measles, parvoviruses, yellow fever, dengue fever, polio, rabies and the viruses that cause hepatitis A and C, as well as COVID-19, which has been seen to cause this in persons otherwise thought to have a "low risk" of the viruss effects. COVID-19 Cardiomyopathy
Patients with Covid-19 frequently experience heart issues. According to studies, people who have had previous cardiovascular conditions like cardiomyopathy, hypertension, coronary heart disease, or arrhythmia are more likely to become critically ill from SARS-CoV-2 infection. Myocarditis may result from a direct viral infection of the myocardium. Cardiovascular biomarkers like troponin, lactate dehydrogenase, high sensitivity amino-terminal B-type natriuretic peptide, creatinine kinase, and creatinine kinase myocardial band, which indicate myocardial damage, increase in concentration in response to covid-19. Hundreds of studies have reported myocarditis/myopericarditis caused by Covid-19 infection in living patients, with a male predominance (58%), and a median age of 50 years. See also
Coxsackievirus-induced cardiomyopathy
Myocarditis
Pericarditis
Vaccine adverse event

References
External links
Myocarditis on emedicine