The Australian mother, who identifies herself online as Sarah Walker RN, shared in the private Facebook group “Stop Mandatory Vaccination” that her son, whose name has been redacted, contracted chickenpox and that she planned to “help” other children in the community by spreading the virus through candy.

“So my beautiful son [redacted] has the chickenpox at the moment and we’ve both decided to help others with natural immunity this Halloween!” Walker wrote. “We have the packaging open and closing down pat and can’t wait to help others in our community.”

Walker’s message was screenshot and shared on Light for Riley, a page dedicated to protecting “babies & families from vaccine-preventable diseases” in honor of Riley Hughes, a baby boy who tragically died from whooping cough in March 2015.