Note the date. Why? What changed?
“ Vaccine manufacturer Merck has abandoned development of two coronavirus vaccines, saying that after extensive research it was concluded that the shots offered less protection than just contracting the virus itself and developing antibodies.The company announced that the shots V590 and V591 were ‘well tolerated’ by test patients, however they generated an ‘inferior’ immune system response in comparison with natural infection.”
https://principia-scientific.com/merck-scraps-vaccine-says-better-to-catch-covid-virus-recover/