Kidle Corporation is the leading American manufacturer of diagnostic healthcare products sold worldwide. On May 8, 2020, the U.S. Food and Drug Administration (FDA) issued its first emergency use permit (EUA) to test covid-19 antigen, a new class of tests for use in a continuing pandemic. These diagnostic tests quickly detect parts of proteins on or inside the virus by testing samples collected from the nasal cavity using swabs. Kuidel was founded by Dr. David H. Katz, M., started its operations in 1981 and launched its first products in 1984. Quidel was founded in 1991 when antibodies merged from both Kuidel and Monclonal. On June 18, 1997 Kiddell settled a lawsuit with Beckton Dickinson. Quiddell was accused of violating patents on Beckton's nodal and breast-based products. Kuidel agreed to purchase a product license and pay royalties on sales of its products. In February 2004, Inverness Medical filed a lawsuit against Kuidel for patent infringement. In the same month, against Quidel against Inverness.In May 2020, Quidel Sofia 2 SARS via antigen via became the first COVID-19 antigen test to be granted emergency use authorization (EUA) by the FDA.