Sambath Simand Satyendra Singh2026-05-22November 1https://cam-ed-oar.com/handle/cam-ed-oar/504COVID-19 is a contagious infection that was detected in 2019. The disease was unique in how people became ill so quickly and succumbed to death. Infected by COVID-19, over six million people perished. However, the vaccine was invented in 2020, and people have been able to take it since 2021. The vaccine is a preparation that stimulates the body’s immune response against diseases and is usually administered through needle injections, orally by mouth or sprayed into the nose (CDC, 2021). When taken in the body, it generates antibodies that form protection against a specific disease. These diseases could be seasonal or pandemic, impacting citizens, healthcare systems, and economies worldwide. Following the COVID-19 outbreak, service-related firms suffered as it restricted people-to-people contact. COVID-19 also affected customer service (Camacho et al., 2022).