It’s booster week in the USA and no one’s sure what’s going on thanks to Joe Biden and his scientific brain trust having made a hash of the policy. The Sunday shows will try to make sense of it with America’s top two public-health bureaucrats, Anthony Fauci and his boss at NIH, Francis Collins. Fauci will be on “This Week,” “Meet the Press,” and “State of the Union” while Collins stops by “Face the Nation” and “Fox News Sunday” to clarify the state of play:

— Despite Biden’s promise last month, not all adults will be eligible for boosters. Only seniors will.

— Despite Biden’s promise last month, only Pfizer recipients will be eligible for now. The jury’s still out on Moderna and Johnson & Johnson.

— Despite Biden saying people would be eligible eight months after their second dose, the timetable at the moment is uncertain.

— Despite Fauci speculating repeatedly that three doses might be needed to fully protect people, most Americans will remain eligible for only two.

— Despite assurances that two doses are enough to keep adults out of the hospital, the CDC’s own data shows Pfizer recipients’ protection from severe illness declining over time.

Fauci and Collins will preview the CDC meeting scheduled for this coming week to find a way forward. Hopefully Fauci will also have to answer a hard question or two today about why he told Congress his agency didn’t fund gain of function research in Wuhan when documents obtained by The Intercept suggest otherwise.

Elsewhere this morning, GOP Sen. Bill Cassidy will tell “Meet the Press” that it’s time for Pelosi to pass the bipartisan infrastructure bill that’s withering on the vine in the House. And former Joint Chiefs chairman Mike Mullen will weigh in with “This Week” on whether Mark Milley is a hero, a traitor, or a bit of both. The full line-up is at the AP.