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1.
Rev Salud Publica (Bogota) ; 16(1): 114-27, 2014.
Artigo em Espanhol | MEDLINE | ID: mdl-25184457

RESUMO

Nonlinear differential equations were used for formulating a mathematical model describing the dynamics of HIV interaction with CD4 T-cells which are considered to be activated or not activated during recognition of viral particles; in either case they are susceptible to HIV infection. The system's equilibrium points were found and local stability was determined for trivial equilibrium or the absence of infection based on the basic reproduction number. The model was used for numerical simulation to show infected cell and viral load patterns regarding the variations of some parameters. The model was then reformulated, considering a cytotoxic cellular immune response and numerical simulation was run again.


Assuntos
Linfócitos T CD4-Positivos/imunologia , Citotoxicidade Imunológica , Infecções por HIV/imunologia , Modelos Teóricos , Humanos
2.
Rev. salud pública ; 16(1): 103-115, ene.-feb. 2014. ilus, tab
Artigo em Espanhol | LILACS | ID: lil-717115

RESUMO

Con base en ecuaciones diferenciales no lineales se formula un modelo matemático que describe la dinámica de interacción del VIH con células T CD4, que se considera que pueden ser activadas o no activadas en el reconocimiento de partículas virales; en cualquiera de los dos casos, son susceptibles a la infección con el virus. Se encuentran los puntos de equilibrio del sistema y en el caso particular del equilibrio trivial o de ausencia de infección, se determina su estabilidad local con base en el número básico de reproducción. Se efectúa además la simulación numérica del modelo para establecer el comportamiento que presentan las células infectadas y la carga viral, frente a variaciones de algunos de los parámetros. Finalmente, se reformula el modelo considerando respuesta inmune celular de tipo citotóxico y se realiza la simulación numérica.


Nonlinear differential equations were used for formulating a mathematical model describing the dynamics of HIV interaction with CD4 T-cells which are considered to be activated or not activated during recognition of viral particles; in either case they are susceptible to HIV infection. The system's equilibrium points were found and local stability was determined for trivial equilibrium or the absence of infection based on the basic reproduction number. The model was used for numerical simulation to show infected cell and viral load patterns regarding the variations of some parameters. The model was then reformulated, considering a cytotoxic cellular immune response and numerical simulation was run again.


Assuntos
Humanos , /imunologia , Citotoxicidade Imunológica , Infecções por HIV/imunologia , Modelos Teóricos
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