It would sound more natural if you add “have been.” For example “new drastic measures have been implemented in order to stop the virus spreading.” The way you said it isn’t wrong though. I hope this helps :)

This is perfect for a newspaper headline. If you're using it as a sentence with proper grammar, use this: "New drastic measures have been implemented to stop the virus from spreading."

I agree with Siraj.

I agree with Siraj but I'd like to provide some additional information worth noting. "New drastic measures implemented to stop the virus from spreading" is a perfectly grammatical sentence. However, this writing style is typically used in newspaper headlines where the auxiliary verbs have been dropped. Because newspaper headlines are limited by the space available on the printed page, word choice and clarity are crucial to a good headline. 1. Normal speech New drastic measures have been implemented to stop the virus from spreading. 2. Newspaper headlines New drastic measures implemented to stop virus from spreading. Both sentences are in the passive voice. Note that even articles such as "a" and "the" are dropped in newspaper headlines.

My first thought was exactly what Siraj said: "New drastic measures have been implemented to stop the virus from spreading." I also like "New drastic measures implemented to stop the virus from spreading include..." then stating some of the measures. As written, I think it reads more like a headline than a sentence from a paragraph.