STUDIES UPON THE ETIOLOGY OF DENGUE FEVER : II. CULTIVATION AND NATURE OF THE VIRUS

Area of Science:

• Microbiology
• Virology
• Infectious Diseases

Background:

• Dengue fever is a significant public health concern with complex etiology.
• Previous research has explored various infectious agents, including spirochetal organisms, in relation to dengue.

Purpose of the Study:

• To investigate the potential etiological role of a minute, cultivable organism in dengue fever.
• To characterize the organism and its effects in experimental animal models.

Main Methods:

• Cultivation of a minute organism using specialized media for spirochetal growth.
• Injection of culture filtrate into guinea pigs to observe physiological reactions.
• Microscopic examination and subculturing of the organism from blood and filtrates.
• Comparison of experimental reactions with those induced by human dengue blood.

Main Results:

• A minute organism, appearing as globoid bodies (0.1-0.3µm), was successfully cultivated.
• The organism and its filtrate induced pyrexial and leucocytic reactions in guinea pigs, mimicking human dengue responses.
• The organism passed through Berkefeld filters (N and V), and its filtrate produced similar globoid bodies upon subculturing.
• No demonstrable spiral organisms were found in dengue patient blood or inoculated animals, despite extensive searching.

Conclusions:

• The cultivated minute organism, characterized by globoid bodies, shows potential etiological relevance to dengue fever.
• The experimental reactions in guinea pigs support a possible link between this organism and dengue.
• Further research and confirmation are necessary to definitively establish the etiological relationship.