MILAN, Jan 23 (Reuters) - Delays in supply of vaccines to Italy from Pfizer and, possibly, AstraZeneca amount to serious violations of contractual agreements and Rome will take countermeasures, Prime Minister Giuseppe Conte said.

In a post on Facebook Conte said the delays were causing "enormous damage" to Italy and other countries.

"This is unacceptable," Conte wrote. (Reporting by Valentina Za; Editing by Alex Richardson)