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Now the pandemic has given anti-vaccine advocates an opportunity to field-test a variety of messages and find new recruits.

Vassiliou says that he has received funding to field-test the system and partner with scientists on the ground to refine the invention.

“It usually takes years to field-test a vaccine.”

Dr. Doherty said her team hoped to field-test the spray system in the next 12 to 18 months.

The bureau had not had time to field-test the question for the census, but there were plenty of reasons to predict it would have a negative impact in the current political climate.