The new Pfizer vaccine is hailed for its excellent efficacy. This does not mean it is without problems which require attention, also because they are too dangerous to be ignored. First of all, haste: the lack of data on safety could mean some minor cases of Covid were overlooked. Data on the asymptomatic disease rate are also lacking. The two deaths after vaccination arouse perplexity, not for the number, but because the causal link is not explained, ie how and if the correlation with the vaccine was excluded or if it was the trigger of these deaths. But the most serious aspect of the study is that it was decided to stop the research prematurely, that is without deciding to monitor the adverse effects of the vaccine. But, privileging (questionable) efficacy over safety is unethical and unscientific.