CF Ag Adenovirus is intended for complement fixation test to detect antibodies against the Adenovirus group specific (mainly hexon) antigens in serum samples. A single positive antibody titre to CF antigens indicates a contact with the virus but it does not allow a conclusion as to the time of contact (recent or past). A seroconversion or a four–fold rise in titre between serum samples taken during the acute and the convalescent phase of the disease is suggestive of a recent Adenovirus infection. CF Ag Adenovirus contains a mixture of the most common Adenovirus serotypes (1–7 and 14).