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Choose whether to vaccinate your population or rely on herd immunity. If vaccinating, use the orange and grey sliders to select the rate of daily vaccination. You can also choose how effective the vaccine will be. If you decide to rely on natural herd immunity, no vaccination will be used, as people must be infected to become immune.
Vaccinations
Would you like to vaccinate your population to try to reach herd immunity?
You have chosen to vaccinate the population of your city.
Vaccine rate
1% is a very high daily vaccination rate (in a city of 12 million people, that would mean vaccinating 120,000 people per day). Daily vaccination rates below 0.4% are more realistic.
Vaccine effectiveness
mRNA vaccines, like those made by Pfizer/BioNTech and Moderna, that only use small bits of virus RNA wrapped in lipids (like oils), are around 90-95% effective. Viral vector vaccines, like those of Johnson & Johnson and AstraZeneca, use weakened viruses to deliver COVID-19 proteins or genetic materials. Some of the viral vector vaccines tested so far are around 70-85% effective.
Rely on natural herd immunity
You have chosen to rely on your population’s natural herd immunity. Because of this, none of the people in your city will be vaccinated. The people in your city will continue to be at a greater risk of disease and death.
Herd-immunity is protection that can occur if enough of a population is vaccinated against a disease. When enough people are vaccinated, the spread of the disease slows or even stops altogether. Unless enough people are vaccinated, the illness will continue to spread. “Natural” herd immunity, without vaccination, is an unrealistic goal. With many diseases, millions of people would have had to die, and natural herd immunity still may never have been reached, due to population growth and loss of immunity.