AE=any new unfavorable symptom, sign, or disease or worsening of a preexisting condition that may not have a causal relationship with treatment.

SAE= any of the the following: is life-threatening (defined as an event in which the subject was at risk of death at the time of the event; it does not refer to an event which hypothetically might have caused death if it were more severe), requires inpatient hospitalization or causes prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect, is an important medical event (defined as a medical event(s) that may not be immediately life threatening or result in death or hospitalization but, based upon appropriate medical and scientific judgment, may jeopardize the subject or may require intervention \[eg, medical, surgical\] to prevent one of the other serious outcomes listed in the definition above.) Examples of such events include, but are not limited to, intensive treatment in an emergency room or at home for allergic bronchospasm; blood dyscrasias or convulsions that do not result in hospitalization

The CDC disease staging system assesses the severity of HIV disease by CD4 cell counts and by the presence of specific HIV-related conditions. CD4 counts are classified as 1: ≥500 cells/µL, 2: 200-499 cells/µL, and 3: \<200 cells/µL. Children with HIV infection are also classified in each of several categories. Category N: Not symptomatic. Category A: Mildly symptomatic. Category B: Moderately symptomatic. Category C: Severely symptomatic.

Criteria of the Division of AIDS for grading the severity of adult and pediatric adverse events as follows: Grade (Gr) 1=mild; Gr 2=moderate; Gr 3=severe; Gr 4=potentially life-threatening. Neutrophils (absolute) (adult and infants \>7 days): Gr 1=1.000-1300/mm\^3; Gr 2=750-999 mm\^3; Gr 3=500-749 mm\^3; Gr 4= \<500 mm\^3. Alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase: Gr 1=1.25-2.5\*upper limit of normal (ULN); Gr 2=2.6-5.0\*ULN; Gr 3=5.1-10.0\*ULN; Gr 4= \>10.0\*ULN. Bilirubin, total (adults and infants \>14 days): Gr 1=1.1-1.5\*ULN; Gr 2=1.6-2.5\*ULN; Gr 3=2.6-5.0\*ULN; Gr 4= \>5.0\*ULN. Lipase: Gr 1=1.1-1.5\*ULN; Gr 2=1.6-3.0\*ULN; Gr 3=3.1-5.0\*ULN; Gr 4= \>5.0\*ULN. Bicarbonate, serum low: Gr 1=16.0 mEq/L-\<lower limit of normal; Gr 2=11.0-15.9 mEq/L; Gr 3=8.0-10.9 mEq/L; Gr 4= \<8 mEq/L. By criteria of the World Health Organization: Amylase: Gr 1=1.0-1.39\*ULN; Gr 2=1.40-2.09\*ULN; Gr 3.=2.10-5.0\*ULN; Gr 4= \>5.0\*ULN.