“… 45 , 47 , 53 , 55 Otherwise, non-institutional websites showed an 8.6-fold increase in belonging to the category of negative or ambiguous pages; 45 , 53 these pages used a relatively high number of images that could improve the intelligibility of the text, as the denotative meaning of technical terms, names of major vaccine manufacturers and other registered trademarks (Big Pharma conspiracy theory), accentuated fatal risks (high usage of the word death) and words related to politics (conspiracy theories). 24 , 29 , 34 , 45 These findings were confirmed by analyzing keywords relevant to tweets with positive sentiments (responsibility, disease, thanks, ignorance, science, medicine and save) and negative sentiments (damage, pharmaceutical, doctor, mercury, baby, drug, law, and oblige). 29 Interestingly, Arif N et al 39 showed that nearly 71% of commercial websites had a negative bias toward vaccines, after searching for vaccination-related topics on search engines YouTube videos with a negative tone were more viewed, shared, and had more likes than those with a positive or neutral tone.…”