So far two countries have exited the worldwide COVID-19 pandemic using U.S.-made vaccines (Israel and the United States), while two other countries have seen infection rates rising despite heavy use of Chinese-made vaccines (Chile and Seychelles).Success of U.S. vaccinesIsrael achieved herd immunity by vaccinating almost 60% of its population using the U.S.-made Pfizer vaccine. According to a chart published by Worldometer, the COVID death rate has fallen to almost zero in Israel.Similarly, the United States exited the pandemic the week of March 20, when just 25% had been vaccinated, compared to 45% today. That was the week when deaths in...