Camp Upton later housed a convalescent and rehabilitation hospital. Laboratory diagnosis is made with acute and convalescent titers of serum antibodies to Echovirus. Paired acute and convalescent samples are preferred for serological diagnosis of leptospirosis in animals. Now penniless, Edwards was a charity patient at the Virgil Convalescent Hospital in Hollywood, California. During the war, Downton Abbey is temporarily converted into an officers' convalescent hospital. In 1921, there were 25,981 patients in nursing and convalescent homes. Nevertheless, he experimented with the convalescent serum of survivors of the first acute symptom. Stevens entered the Avery Convalescent Hospital on May 20. Back at the hospital, Frederic is told his convalescent leave is canceled. He was returned to the UK, spending the next few months in military convalescent hospitals. He was treated with human interferon and convalescent serum. Convalescent care facilities are sometimes recognized by the acronym CCF. Financial support was needed to pay for their convalescent care. Other research directions include the development of a COVID-19 vaccine and convalescent plasma transfusion. Glamis was turned into a convalescent home for wounded soldiers, which Elizabeth helped to run.