ImmuCell Corporation is an animal health company that develops, manufactures, and sells products to improve the health and productivity of dairy and beef cattle in the United States and internationally. It operates through two segments, Scours and Mastitis. Its products include First Defense, an orally delivered scours preventive for calves with claims against E. coli, coronavirus, and rotavirus; Tri-Shield First Defense, a passive antibody product for treating these same pathogens; California Mastitis Test, an on-farm diagnostic for somatic cell counts in milk and for identifying which quarter of the udder is mastitic; and Dual-Force First Defense, a bivalent gel tube formulation. The company is also developing Re-Tain Drug Product, a Nisin-based intramammary treatment for subclinical mastitis in lactating dairy cows, and sells its products through animal health distributors. ImmuCell Corporation was incorporated in 1982 and is based in Portland, Maine.