Can the flu vaccines also contain extraterrestrial marker chips?

They do include marker chips, as that will be a fixture going forward, because it will further support the annihilation plans to make it easy to round up stragglers and ensure finding everyone who might be in hiding. As we have said before, planning to hide out is not a useful strategy. It might buy time but will not save you in the end because they have other ways to locate human beings and, being able to clear the vast majority quickly, will have no trouble pursuing the stragglers. Any time spent in hiding like that, with no modern conveniences and supplies, will be a dreadful existence not worth having—it is better to go quickly if the annihilation is launched.