Action of homeopathic medicines Arnica montana, Gelsemium sempervirens, Belladonna, Mercurius solubillis and nosode on in vitro growth of Streptococcus pyogenes

Resumo

Introduction: Bacteria are the microorganisms with greatest pathogenic potential for human beings. The infections caused by bacteria are usually serious and require treatment with antibacterial drugs. One of such pathogenic bacteria is Streptococcus pyogenes, which is associated with several infections diseases, including tonsillitis, erysipela and endocarditis, being that rheumatic fever might occur as a post-infection complication. There are records in the literature of biological effects in bacteria subjected to ultra-diluted solutions. On those grounds, we sought to test the effects of homeopathic medicines Belladonna (Bell), Mercurius solubillis (Merc), Gelsemium sempervirens (Gels) and S. pyogenes nosode on the in vitro growth of S. pyogenes. Arnica montana (Arn) was used as control, as it is believed not to have any effect in the treatment of infections. Materials and methods: The homeopathic medicines were used in dilutions 12cH and 30cH in concentration 2, 4 and 6 drops/3 mL of BHI (Brain Heart Infusion) with 100 µL of bacteria in concentration 0.5 McFarland scale. The solution was incubated at 37 ºC for 20 hours and read in spectrophotometer at 600 nm. Results: Medicines nosode and Bell in dilution 12cH and 30cH and concentration 2, 4 and 6 drops induced significant inhibition of the in vitro growth of S. pyogenes; Arn 30cH in concentration 6 drops promoted bacterial growth. Conclusion: Homeopathic medicines might have an action on the in vitro growth of bacteria, which might be related with their clinical applications.