Coronavirus

Classic “herd immunity” is achieved when enough members of a population get infected and acquire natural immunity so that too few uninfected members are left to spread the disease.   The threshold percentage depends on how infectious the disease is and for COVID-19 it is not known but generally believed that 65%-75% of the population needs to develop immunity to stop this pandemic.   For humans, there are two more methods to slow or stop a pandemic: behavior immunity and vaccine immunity.   Governments can convince their citizens, or if necessary mandate, many public health policies that can mitigate the spread of disease.   Keeping your distance, wearing a mask, selective isolation, and improving personal hygiene are things that cattle can’t do but humans can and should do.   People in many countries such as Taiwan, New Zealand, Australia, and Vietnam have been able to control COVID-19 for over a year now without a vaccine or natural immunity.   Even in countries with greater emphasis