For non-US citizens who are nonimmigrants (an F-1 visa holder), you will need to show proof of being fully vaccinated against COVID-19 with an approved vaccine before you travel by air to the US from a foreign country. Travelers to the US no longer have to show proof of a negative viral COVID-19 test.
Please click here to see the Center for Disease Control (CDC) page for regulations and details, and here are a list of countries where travelers are prohibited entry to the USA.