Viral Plaque AssaySkin Diseases, ViralCat DiseasesVirus ReplicationHemolytic Plaque TechniqueCell LinePlaque, AtheroscleroticDental PlaqueVirus CultivationAntibody-Producing CellsCytopathogenic Effect, ViralRickettsia rickettsiiPost and Core TechniqueRickettsia prowazekiiRickettsiaPancreatinHaplorhiniCulture TechniquesIdoxuridineNeutral RedVirologyMethodsVero CellsMethylcellulosePokeweed MitogensRickettsia typhiCercopithecus aethiops