Attempts to rigidly apply Koch's postulates to the diagnosis of viral diseases in the late 19th century, at a time when viruses could not be seen or isolated in culture, may have impeded the early development of the field of virology.
Nastojanja da se Kochovi postulati kruto primjenjuju u dijagnozi virusnih bolesti u kasnom 19. stoljeću, u vremenu kada se virusi nisu mogli vidjeti ili izolirati u kulturi, vjerojatno je usporilo rani razvoj polja virologije.