A parasitic or infectious agent was sought for beriberi and other disease which turned out to be due to completely different aetiologies.

例如，脚气病以及其它疾病病原是由寄生虫或感染性因子导致的，然而，最后证实完全不是。

There were no reliable clinical predictors of viral pneumonia, although several variables were independently associated with some aetiologies.

尽管多种变量与病因有独立的相关性，却没有病毒性肺炎可靠的临床预测因子。