Action of antibiotic oxacillin on in vitro growth of methicillin-resistant Staphylococcus aureus (MRSA) previously treated with homeopathic medicines.

BACKGROUND: Resistance to antibiotics is a major public health concern worldwide. New treatment options are needed and homeopathy is one such option. We sought to assess the effect of the homeopathic medicine Belladonna (Bell) and a nosode (biotherapy) prepared from a multi-drug resistant bacterial species, methicillin-resistant Staphylococcus aureus (MRSA), on the same bacterium. METHODS: Bell and MRSA nosode were prepared in 6cH and 30cH potencies in 30% alcohol and sterile water, according to the Brazilian Homeopathic Pharmacopeia and tested on MRSA National Collection of Type Cultures (NCTC) 10442. We assessed in vitro bacterial growth, deoxyribonuclease (DNAase) and hemolysin activity, and in vitro bacterial growth in combination with oxacillin (minimum inhibitory concentration - MIC). All values were compared to control: 30% alcohol and water. RESULTS: In vitro growth of MRSA was statistically significantly inhibited in the presence of Bell and nosode 6cH and 30cH compared to controls (p < 0.0001); and with combination of Bell or nosode 6cH and 30cH and oxacillin (p < 0.001). Bell 30cH and nosode 6cH and 30cH significantly decreased bacterial DNAse production (p < 0.001) and reduced red blood cell lysis. CONCLUSIONS: Cultures of MRSA treated with Belladonna or MRSA nosode exhibited reduced growth in vitro, reduced enzymatic activity and became more vulnerable to the action of the antibiotic oxacillin. Further studies are needed on the biomolecular basis of these effects.

Rapid identification of moulds and arthroconidial yeasts from positive blood cultures by MALDI-TOF mass spectrometry.

Moulds and arthroconidial yeasts are potential life-threatening agents of fungemia in immunocompromised patients. Fast and accurate identification (ID) of these pathogens hastens initiation of targeted antifungal therapy, thereby improving the patients' prognosis. We describe a new strategy that enabled the identification of moulds and arthroconidial yeasts directly from positive blood cultures by MALDI-TOF mass spectrometry (MS). Positive blood cultures (BCs) with Gram staining showing hyphae and/or arthroconidia were prospectively selected and submitted to an in-house protein extraction protocol. Mass spectra were obtained by Vitek MS™ system, and identifications were carried out with in the research use only (RUO) mode with an extended database (SARAMIS™ [v.4.12] plus in-house database). Fusarium solani, Fusarium verticillioides, Exophiala dermatitidis, Saprochaete clavata, and Trichosporon asahii had correct species ID by MALDI-TOF MS analysis of positive BCs. All cases were related to critically ill patients with high mortality fungemia and direct ID from positive BCs was helpful for rapid administration of targeted antifungal therapy.

Ação dos medicamentos homeopáticos Arnica montana, Gelsemium sempervirens, Belladonna, Mercurius solubillis e nosódio sobre o crescimento in vitro da bactéria Streptococcus pyogenes / Action of homeopathic medicines Arnica montana, Gelsemium sempervirens,Belladonna, Mercurius solubillis and nosode on in vitro growth of Streptococcus pyogenes

Introdução: As bactérias são os micro-organismos com maior potencial patogênico para o ser humano. As infecções causadas por elas são na sua maioria graves e devem ser tratadas com drogas antibacterianas. Uma dessas bactérias patogênicas é Streptococcus pyogenes, causadora de diversas infecções, incluindo amigdalite, erisipela e ndocardite, sendo que em alguns pacientes ocorre febre reumática como complicação pós-infecção. Diversos trabalhos na literatura demonstram efeitos biológicos em bactérias após contato com soluções ultra-diluídas. Embasados nessas informações, propusemos avaliar o efeito dos medicamentos homeopáticos Belladonna (Bell), Mercurius solubillis (Merc), Gelsemium sempervirens (Gels) e nosódio de S. pyogenes no crescimento in vitro da bactéria S. pyogenes. Arnica montana (Arn) foi usado no presente trabalho como controle, por não ser, aparentemente, indicada no tratamento de infecções bacterianas. Materiais e métodos: Os medicamentos foram utilizados nas diluições de 12cH e 30cH, nas concentrações de 2, 4 e 6 gotas em 3 mL de meio BHI (Brain Heart Infusion) com 100µL da bactérias na concentração 0,5 da escala de McFarland. A solução foi incubada a 37ºC por 20 horas e submetida à leitura em espectrofotômetro a 600nm. Resultados: Os medicamentos nosódio e Bell nas diluições 12cH e 30cH com 2, 4 ou 6 gotas inibiram significativamente o crescimento in vitro de S. pyogenes, enquanto Arn 30cH na concentração de 6 gotas estimulou esse crescimento. Conclusão: Medicamentos homeopáticos podem ter ação sobre o crescimento in vitro de bactérias, sendo que essa ação pode estar relacionada a sua aplicação clínica.

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; Arn30cH 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.