Peter Chew Formular for calculate Covid-19 Vaccine efficiency
Authors: chew Peter 
Published: May 2021

Abstract
Background: The World Health Organization (WHO) said the situation in India was a "devastating reminder" of what the coronavirus could do. India shifts from mass vaccine exporter to importer, worrying the world. Every country needs to vaccinate its citizens faster, vaccination can reduce viral load. This results in vaccination that can reduce transmission, preventing serious illness and death'. Therefore, Countries with higher levels of vaccination can prevent them from becoming "Second India".Preprint study, Vaccination Education App (1). [Peter Chew, 2021] shows that most people do not take the covid-19 vaccine because they question the safety and effectiveness of the vaccine. Therefore, it is important to create a simple formula for calculate the efficiency of the covid-19 vaccine. The purpose of creating this calculation formula is to allow the public to calculate the efficiency of the covid-19 vaccine by themselves, so that they can understand the effectiveness of the vaccine and decide to take the vaccine. This helps to get a high response to COVID vaccinationMethods: Use the Data publish at The New England JOURNAL of MEDICINE, Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine [Fernando P. Polack et all , 2020]. Calculate of Pfizer BioNTech’s COVID-19 vaccine efficiency by using normal formular and Peter Chew Formular , show that the same result are obtain, which is 95.0599 %. In addition, By using public news information, the public can use the Peter Chew formula to easily calculate Covid-19 vaccine efficacy. This is to ensure public can do the calculation themselves. A calculation of relative risk is also provided to provide more information to persuade the public to take the vaccine.Results: The efficiency of Pfizer BioNTech's COVID-19 vaccine for Malaysian medical worker calculated by using the Peter Chew formula is 95.0599 %. In addition, the calculation of Peter Chew's formula also shows that before the vaccination, about 12 medical staff were infected every day, but after the full vaccination, only about one medical worker was infected every two days. The calculation of relative risk can also make it easier for the public to know that people who are not vaccinated with Pfizer BioNTech's COVID-19 vaccine are 22 times more likely to be infected than people who are fully vaccinated. The above results can convince those who easily question the effectiveness of vaccination.Conclusions: Peter Chew Formular easy to calculate, and the data required for the Peter Chew Formular calculation easy to obtain from public news. This is to ensure that the public can calculate the efficacy of the vaccine by themselves. The information on the calculation can let public compare the average target group get infected every day before and after fully vaccination is also an advantage to let public know the effectiveness of vaccination. One of the advantage of Peter Chew formulator is that we can assume a high target population of vaccination with k = 100, such as the medical worker group When k = 100, the Peter Chew formular calculation becomes very simple. The Proof of Peter Chew Formular must also be shown.