Merck, Novartis and Pfizer are all well-known vaccine manufacturers as of 2015. All three of these companies operate in the United States and multiple other countries, according to their websites.
Merck has developed vaccines that either cure or create conditions such as measles, hepatitis and the Varicella virus. Information about these vaccines is available on the company’s website. Novartis provides similar vaccines and treatments that treat cardiovascular disease, respiratory illnesses, dermatological conditions and more, notes NovartisPharmaceuticals.com.
Pfizer develops vaccines for a range of diseases and ailments. Its research and development efforts focus on the prevention of pneumococcal disease. Pfizer also explores and tests new therapeutic vaccines for fighting smoking addiction, reports the company's official website.