In general, a second specimen should be collected more than a month later and retested for persons with indeterminate Western blot results.
Also, what is often the case in pharmacogenetics research, a second specimen or residual specimen is requested for molecular genetics studies in order to better understand the disease, its response to drug and the possible adverse events.
In these situations, a second specimen is collected and tested for HIV infection.
A live rhinoceros was not seen again in Europe until a second specimen, named Abada, arrived from India at the court of Sebastian of Portugal in 1577, being later inherited by Philip II of Spain around 1580.
In 6 cases, a second specimen was taken during the procedure.
In 1981 Colbert described the remains (collected by a Harvard University field party in 1977), along with a second specimen, as Scutellosaurus lawleri.
However, this observation, and a subsequent observation that identified a second specimen in the region in 1956, has not been confirmed and thus the snake's distribution in this area is inconclusive.
The procedure was then repeated to acquire a second specimen in the same eye.
In patients whose first specimen tested negative, 25 had a second specimen (of any type) collected within the first 5 days of illness.
A sixth specimen is included in one of five different OTUs of D. humeralis.
