Any unfavourable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. A serious adverse event (SAE) is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening situation (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly/birth defect in the offspring of a participant who received MEDI7836. Treatment-emergent adverse events between administration of investigational product and Day 281 that were absent before treatment or that worsened relative to pretreatment state.

Participants were evaluated for manifestations of injection site reactions.

An abnormal laboratory finding which required an action or intervention by the investigator, or a finding judged by the investigator to represent a change beyond the range of normal physiologic fluctuation were reported as an adverse event. Treatment-emergent adverse events between first dose of study drug and Day 281 after the last dose that were absent before treatment or that worsened relative to pre-treatment state. Laboratory evaluations (haematology, serum chemistry and urinalysis) of blood and urine samples were performed.

Vital sign parameters included blood pressure, temperature, pulse rate, respiratory rate and weight. Physical examination included assessment of general appearance, weight, head, ears, eyes, nose, throat, neck, skin, cardiovascular system, respiratory system, abdominal system, and nervous system. Criteria for abnormal physical findings was based on investigator's discretion. TEAEs were present at baseline that worsened in intensity after administration of study drug or events absent at baseline that emerged after administration of study drug until Day 281 after the last dose of study drug.

AEs observed in participants with clinically significant ECG abnormalities were assessed. ECG parameters included heart rate, RR, PR, QRS, QT and QTc intervals. Treatment-emergent adverse events between administration of investigational product and Day 281 that were absent before treatment or that worsened relative to pre-treatment state.