Question

Why it is difficult to develop vaccines for some diseases?​

Answer 1

Answer:

As certain ingredients or materials are required which can be very hard to get. And besides that finding out how to make a vaccine for a disease is a lot more difficult than it sounds like for example we can take the corona virus, it was difficult to make the vaccine and now it's even more difficult to distribute it to everyone.

Explanation:

Hope it helps you.

Answer 2

Answer:

It is not difficult to create vaccinations against all viruses, except a few like HIV. This is because HIV virus mutates easily and attacks the immune system of the body, thereby weakening the cells which fight against the viruses and keep us safe.