All patients in this non-interventional, post-marketing observational study, who were prescribed lopinavir/ritonavir (Kaletra) in accordance with the local Prescribing Information for the treatment of HIV infection.

Lopinavir/ritonavir evaluated separately in patients who were naive to previous antiretroviral treatment and those who were not.

Number of patients with adverse drug reactions, defined as adverse events for which the causal relationship with Kaletra was something other than "not related" by the investigator (i.e., "probable," "possible," or "unclear"), that occurred in ≥ 5% of patients. Adverse drug reactions are reported by preferred term and inclusive of all those reported at each visit. Although a patient may experience a particular preferred term more than once, each patient was counted only once for each preferred term.

The evolution of patients' CD4-positive (CD4+) T-lymphocyte counts after starting treatment with Kaletra was assessed by measuring the number of CD4+ cells at baseline and each subsequent study visit. CD4+ counts are reported as the number of CD4+ cells per cubic millimeter (cmm) and presented by the mean at each visit. Only observed cases were included in analyses; no data were imputed. n = xx, xx is the number of patients naive to previous antiretroviral treatment and those that were not who had CD4+ T-cell counts available for analysis at each study visit.

Number of HIV RNA copies per mL is presented by the mean per visit for patients that were naive to previous antiretroviral treatment and those that were not. HIV-RNA data reported as < 400 copies/mL were considered 399 copies/mL in calculations. The mean and standard deviation of HIV-RNA levels were thus calculated after logarithmic (base 10) transformation (log10 399 is 2.6). Only observed cases were included in analyses; no data were imputed. n = xx, xx is the number of treatment-naive, treatment-experienced participants who had CD4+ T-cell counts available for analysis at each study visit.

All patients in this non-interventional, post-marketing observational study, who were prescribed lopinavir/ritonavir (Kaletra) in accordance with the local Prescribing Information for the treatment of HIV infection.

Number of patients with adverse drug reactions, defined as adverse events for which the causal relationship with Kaletra was something other than "not related" by the investigator (i.e., "probable," "possible," or "unclear"), that occurred in ≥ 5% of patients. Adverse drug reactions are reported by preferred term and inclusive of all those reported at each visit. Although a patient may experience a particular preferred term more than once, each patient was counted only once for each preferred term.

Available data for all patients were included.

All patients in this non-interventional, post-marketing observational study, who were prescribed lopinavir/ritonavir (Kaletra) in accordance with the local Prescribing Information for the treatment of HIV infection.