Considering the fact that he’s been in the flight for the most time where temperatures rarely exceed 25-30 degrees, I don’t think it should an issue. The vaccine can sustain in these temperatures.
Although one has to watch out for worsening of symptoms, such bleeding/oozing from the wound and neurological symptoms such as fever, headache, tingling sensation at bite, confusion, agitation, etc
In such a scenario, please go to an emergency department (A&E in UK) immediately
Next Steps
Watch out for symptoms, if any
Health Tips
Maintain wound hygiene