Altimmune is an immunotherapeutic biotechnology company that develops immunotherapeutic products and vaccines to address public health and biodefense needs. It offers NasoVAX, HepTcell, NasoShield and Oncosyn. The company also develops products for use in companion and commercial livestock and offers immunotherapeutic products for various disease indications. The company was founded in 1997 and is based in Gaithersburg, Maryland with operating sites in the UK and France.