According to a May 2021 survey in the Philippines, Sinovac Biotech was the most preferred coronavirus (COVID-19) brand by Filipino respondents. The brand, which was developed by a Chinese biopharmaceutical company, was chosen by ** percent of Filipinos. In comparison, ** percent of the respondents stated that they prefer the Pfizer-BioNTech vaccine brand. At the time of the survey, ** percent of the COVID-19 vaccines that arrived in the country were China's Sinovac followed by the United Kingdom's AstraZeneca.

As of June 27, 2022, around 93.7 million doses of Pfizer arrived in the Philippines. This was followed by Sinovac and AstraZeneca, with 56.11 million and 38.85 million vaccine doses, respectively.

COVID-19 vaccination in the Philippines started in March 2021.

As of March 10, 2023, there have been 1.1 million deaths related to COVID-19 in the United States. There have been 101,159 deaths in the state of California, more than any other state in the country – California is also the state with the highest number of COVID-19 cases.

The vaccine rollout in the U.S. Since the start of the pandemic, the world has eagerly awaited the arrival of a safe and effective COVID-19 vaccine. In the United States, the immunization campaign started in mid-December 2020 following the approval of a vaccine jointly developed by Pfizer and BioNTech. As of March 22, 2023, the number of COVID-19 vaccine doses administered in the U.S. had reached roughly 673 million. The states with the highest number of vaccines administered are California, Texas, and New York.

Vaccines achieved due to work of research groups Chinese authorities initially shared the genetic sequence to the novel coronavirus in January 2020, allowing research groups to start studying how it invades human cells. The surface of the virus is covered with spike proteins, which enable it to bind to human cells. Once attached, the virus can enter the cells and start to make people ill. These spikes were of particular interest to vaccine manufacturers because they hold the key to preventing viral entry.