Covid Immunity

From covid-19-- and he wants everyone to know.

But medical experts say there's no evidence right now people are immune if they've been infected.

L3: coronavirus outbreak white medical experts still studying covid-19 immunity president claims he is ... they say you can build up some level of immunity for maybe a couple of months...but studys also show...immunity goes down after a few months.

There are documented cases of people who had covid-19 and then got re-infected.

The c-d-c has specifically cautioned people not to assume they are immune.

#### the conversation about immunity to the virus is growing...as the president is cleared for public events once again.

And he is back on the campaign trail ---despite the uncertainty.

Mona kosar abdi has the latest.

L3: coronavirus outbreak white trump hits campaign trail amid covid uncertainty this morning -- president trump preparing to return to the campaign trail... just days after leaving the hospital.

Sot - trump: "it looks like i'm immune for, i don't know, maybe a long time, maybe a short time.

It could be a lifetime.

Nobody really knows, but i'm immune."

.

Kicking off a jam- packed week of back-to-back rallies after his doctor announced the president is no longer at risk of spreading covid.

But during a call with supporters sunday, the president claimed he's not only covid- free... but immune?

To the virus.

.

The president is also touting the experimental treatment, which he credits for his recovery.

Sot - trump: we want to get it brought into the hospitals because i really believe it's a transfusion.

I really believe that it will solve the problems of a lot of people.

But despite promising results for drugs like remdesevir and regeneron's antibody cocktail -- both of which were part of trump's treatment -- the c- e-o of regeneron is now warning the company only has enough doses to treat 50-thousand patients.

Sot - dr. leonard schleifer regeneron "we have to figure out ways to ration this," the president is eager to get back on the campaign trail with his poll numbers slipping.

When it comes to handling the pandemic - our poll shows voters now trust joe biden over trump by 12 points.

Nats of biden: america deserves a president who understands what people are going through.

And now - the president's campaign facing new questions.

Nats from ad a-b-c news confirming doctor anthony fauci did not?

Consent to this new ad... in which he's heard apparently praising the president's response to the pandemic.

Nats from ad "i can't imagine that anybody could be doing more."

Fauci writing in a statement, "i have never publicly endorsed any political candidate.

The comments attributed to me without my permission in the gop campaign ad were taken out of context."

The trump campaign says it plans to keep airing the ad, saying the doctor has praised the president's work in the past.

One of those topics of praise: the administration's decision to restrict travel during the pandemic.

But this morning -- the administration is reportedly in talks with some airlines to fast- track some international travel.

The talks coming even as new infections in the u-k have doubled in the last week - pubs and restaurants in some areas are now facing tighter restrictions.

Mona kosar abdi, abc news, new york fs txt bullets:no senate debate tonight - sen.

Mitch mcconnell ..

& amy mcgrath -7 - 8 p.m.

Meanwhile later