To prepare this report, we used the monitoring tool built by Palver. The WhatsApp sample used has more than 15 thousand groups on the network – a number that can fluctuate depending on the active groups. We highlight that the maximum counter on our platform is 127 forwards per message. Thus, any message with a record of 127 forwards may have been shared in any quantity above this, thus being equivalent to a message with large circulation on the network. To find messages related to vaccination, we use the descriptor “vaccine” in the “All these” option and “covid”, “vaccine”, “mask”, “pandemic”, “social isolation”, “vaccination”, “bivalent”, “myocarditis ”, “vaccine detox” and “coronavirus” in the “Any of these” option. 56.052 messages about vaccination were found between January 1st and September 04th, 2023.