@reddust a large number of diseases that we call old diseases have been eliminated after the era of health safety and all people benefited from health coverage, the story of vaccines did not begin with the first vaccine–Edward Jenner’s use of material from cowpox pustules to provide protection against smallpox. Rather, it begins with the long history of infectious disease in humans, and in particular, with early uses of smallpox material to provide immunity to that disease. i think Food safety has had a major role in addition to the emergence of quality standards and control in all areas
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The old diseases like smallpox were called the disease of the poor throughout human history. Smallpox material used from the past included pus from horse hooves, pus from infected cow udders, pus from infected lesions on humans without any kind of examination what was in the pus. Many say this is were syphilis came from. Cowpox only infects female cows and is not related to human small pox and the lymph fluid from animals injected into humans had nothing to do with human small pox either.
I do not think so many researches confirm that the cells of the body attack the animal vaccine human immunity is relatively weak @reddust
It was and is very common even today...
Anaphylaxis (including anaphylactic shock) and related phenomena such as angioneurotic edema; facial edema, and peripheral edema; Necrotizing retinitis (in immunocompromised individuals); Aplastic anemia; thrombocytopenia (including idiopathic thrombocytopenic purpura (ITP)); Varicella (vaccine strain); Encephalitis; cerebrovascular accident; transverse myelitis; Guillain-Barré syndrome; Bell's palsy; ataxia; non-febrile seizures; aseptic meningitis; dizziness; paresthesia; Pharyngitis; pneumonia/pneumonitis; Stevens-Johnson syndrome; erythema multiforme; Henoch-Schönlein purpura; secondary bacterial infections of skin and soft tissue, including impetigo and cellulitis; herpes zoster.