Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of adverse events as identified by change in baseline safety laboratory measures;Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of serious adverse events (SAEs);Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of solicited signs and symptoms;Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of unsolicited signs and symptoms

Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of adverse events as identified by change in baseline safety laboratory measures;Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of serious adverse events (SAEs);Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of solicited signs and symptoms;Investigate the safety and tolerability of intranasal administration of ChAdOx1 nCov-19 in healthy adult volunteers: Occurrence of unsolicited signs and symptoms