Last year, racing to develop a vaccine in record time, Pfizer made a big decision: Unlike several rival manufacturers, which vowed to forgo profits on their shots during the Covid-19 pandemic, Pfizer planned to profit on its vaccine. On Tuesday, the company announced just how much money the shot is generating. The vaccine brought in $3.5 billion in revenue in the first three months of this year, nearly a quarter of its total revenue, Pfizer reported. The vaccine was, far and away, Pfizer's biggest source of revenue. The company did not disclose the profits it derived from the vaccine, but it reiterated its previous prediction that its profit margins on the vaccine would be in the high 20 percent range. That would translate into roughly $900 million in pretax vaccine profits in the first quarter. The company's vaccine is disproportionately reaching the world's rich " an outcome, so far at least, at odds with its chief executive's pledge to ensure that poorer countries "have the same access as the rest of the world" to a vaccine that is highly effective at preventing Covid-19. As of mid-April, wealthy countries had secured more than 87 percent of the more than 700 million doses of Covid-19 vaccines dispensed worldwide, while poor countries had received only 0.2 percent. Pfizer has kept the profitability of its vaccine sales opaque. The United States, for example, is paying $19.50 for each Pfizer dose. Israel agreed to pay Pfizer about $30 per dose.