As my Rabbi taught me, we can't go back in time and change things so that we have less to regret now. But we can act now in such as way that we have less to regret later.
Since 1974, vaccination has averted 154 million deaths, including 146 million among children younger than 5 years of whom 101 million were infants younger than 1 year. For every death averted, 66 years of full health were gained on average, translating to 10·2 billion years of full health gained.
As my Rabbi taught me, we can't go back in time and change things so that we have less to regret now. But we can act now in such as way that we have less to regret later.
From Google:
Since 1974, vaccination has averted 154 million deaths, including 146 million among children younger than 5 years of whom 101 million were infants younger than 1 year. For every death averted, 66 years of full health were gained on average, translating to 10·2 billion years of full health gained.