un vaccin in English:

Scientists haven't found a vaccine for cancer yet.

smallpox vaccine

We can use her blood to make a vaccine.

The vaccine for this virus does not exist yet.

Jonas Salk developed the polio vaccine in 1952.

In 2010, there was a shortage of H1N1 vaccine.

They give most children a number of vaccines these days to stop them getting serious diseases.

There is no vaccine against HIV infection.