A 15 y.o. boy was twice attacked by bees, as a result he had severe anaphylactic shock. What is the most effective prophylaxis method?

Answer options

1. Protective clothing
2. Limitation of outside staying during summer months
3. Desensibilisation by means of bee venom extract
4. Long-term prophylactic treatment with antihistamines
5. Prescription of corticosteroids for summer