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Attendance system is very important in schools and colleges' The student attendance program has many problems such as it may not be accurate and critical to maintain. Therefore, an existing system that uses a face recognition system increases accuracy and also requires less time than other methods. There are many systems available such as face recognition using IoT, PIR sensors and so on. With face recognition, hardware devices are helpful. But the challenge is to keep all the nerves properly without getting hurt. After learning all the techniques and techniques we try to use the system with Haar Cascade Algorithm with the highest accuracy among them all. It can take pictures from 50- 70cm. We create a graphical interface that takes pictures, builds a database and trains the database with a single click. After seeing the face it will show the student's name and roll number. That information is stored on an automatic attendance sheet by time and date.

The coronavirus disease (COVID-19) emerged in China in December 2019 and has since spread to over 188 countries affecting millions of individuals. Several reports in favour or against the heterologous protection conferred by the BCG vaccine against COVID-19 came up in the initial days of the pandemic and continue to do so. In this study, we compared the three worst-affected nations: The USA, India, and Brazil, their current pandemic scenario, and their respective national BCG immunization policies. USA recommends BCG vaccine only to a specific group of people and never had a national immunization scheme in place. Meanwhile, India introduced a nationwide scheme as early as 1948 and continues to endorse BCG immunization at birth. Brazil used the oral route to administer the BCG vaccine till 1976, and then shifted to intradermal injection. The correlation coefficient for the total number of cases, cases per million, the total number of deaths, deaths per million and case fatality rate ranges between 0.81-0.98. This indicates a very strong positive correlation in the various epidemiological parameters between countries with no national immunization scheme (USA) and countries with stringent national policies on BCG vaccination. The strongest correlation exists between the USA and Brazil followed by Brazil and India which is very closely followed by the USA and India. We found no consistent evidence to infer in favour of the hypothesis that BCG provides any non-specific protection against COVID-19.