ABSTRACT
La COVID-19 clínicamente se presenta con síntomas gripales y dificultad respiratoria con o sin hipoxia que puede progresar en severidad, asociado a la presencia de variantes de SARS-CoV-2 que serían responsables de reinfecciones heterólogas. Este caso muestra una secuencia de cuatro infecciones en el mismo paciente con intervalos de tiempo entre cada infección de alrededor de 5 meses coincidente con los periodos en que se presentaron cuatro olas de la infección en Bolivia. La enfermedad por COVID-19, durante el tercer episodio, fue más severa que las anteriores, con compromiso pulmonar, incremento de la Proteína C Reactiva y daño hepático. Se asume que tal situación responde a una infección heteróloga con una variante diferente a las dos anteriores y la posibilidad de desarrollo del fenómeno ADE. Este caso constituiría al primer reporte documentado de infección recurrente por SARS-CoV-2 y debería servir para sensibilizar sobre la importancia de la vacunación a fin de reducir la posibilidad de reinfecciones.
Clinically COVID-19 presents with flu-like symptoms and respiratory distress with or without hypoxia that can progress in severity, which partially responds to the presence of SARS-CoV-2 variants that would be responsible for heterologous reinfections. This case shows a sequence of four infections with time intervals between each infection of around 5 months coinciding with the periods in which four waves of infection occurred in Bolivia. The Covid-19, during the third episode was more severe than the previous ones with lung involvement, increased C-Reactive Protein and liver damage. It is assumed that such a situation responds to a heterologous infection with a variant different from the previous two and the possibility of development of the ADE phenomenon. This case would constitute the first documented report of recurrent SARS-CoV-2 and should serve to raise awareness about the importance of vaccination in order to reduce the possibility of reinfections.
Subject(s)
COVID-19ABSTRACT
Re-infections with Trypanosoma cruzi are an aggravating factor for Chagas disease morbidity. The Colombian strain of T. cruzi represents multiclonal populations formed by clonally propagating organisms with different tropisms and degrees of virulence. In the present study, the influence of successive inoculations with clones of the Colombian strain, exhibiting different degrees of virulence, on chronic myocarditis and the humoral and cellular immune responses (Col-C1 high virulence, Col-C8 medium virulence and Col-C5 low virulence) were demonstrated. Mice from three groups with a single infection were evaluated during the acute (14th-30th day) and chronic phases for 175 days. An immunofluorescence assay, ELISA and delayed type hypersensitivity (DTH) cutaneous test were also performed. Mice with a triple infection were studied on the 115th-175th days following first inoculation. The levels of IgM and IgG2a were higher in the animals with a triple infection. DTH showed a higher intensity in the inflammatory infiltrate based on the morphometric analysis during a 48 h period of the triple infection and at 24 h with a single infection. The histopathology of the heart demonstrated significant exacerbation of cardiac inflammatory lesions confirmed by the morphometric test. The humoral responses indicate a reaction to the triple infection, even with clones of the same strain.