Is it necessary to fight seven-valent pneumonia vaccine?

Seven-valent pneumonia vaccine belongs to a kind of pneumonia vaccine for children. This vaccine can help children resist pneumonia caused by external viruses. At present, there is no domestic seven-valent pneumonia vaccine. There are imported seven-valent pneumonia vaccines. The price is also relatively expensive. If conditions permit, children can be injected. It is not a vaccine that must be injected.