Prof Peter Hotez MD PhD. (2022, February 7). 1: BA.2 some evidence that it’s even more transmissible than the original omicron which is more transmissible than delta, and so forth. If it takes hold like it did in Denmark it will slow the descent of original omicron here [Tweet]. @PeterHotez. https://twitter.com/PeterHotez/status/1490669166176702466

D’Ancona, F., D’Amario, C., Maraglino, F., Rezza, G., & Iannazzo, S. (2019). The law on compulsory vaccination in Italy: An update 2 years after the introduction. Eurosurveillance, 24(26). https://doi.org/10.2807/1560-7917.ES.2019.24.26.1900371