Greetings and welcome to Vaxart Business Update and First Quarter 2023 Financial Results Conference Call. A question-and-answer session will follow management's opening remarks. Individual investors may submit written questions to ir@vaxart.com. As a reminder, this conference is being recorded.

I would now like to turn the webcast over to your host, Ed Berg, Senior Vice President and General Counsel. .

Good afternoon, and welcome to today's call. Joining us from Vaxart are Andrei Floroiu, Chief Executive Officer; Dr. Sean Tucker, Founder and Chief Scientific Officer; Dr. James Cummings, Chief Medical Officer; and Phillip Lee, Chief Financial Officer.

Before we get started, I would like to remind everyone that during this conference call, Vaxart may make forward-looking statements, including statements about the company's financial results, financial guidance, its future business strategies and operations and its product development and regulatory progress, including statements about its ongoing or planned clinical trials.

Actual results could differ materially from those discussed in these forward-looking statements due to a number of important factors, including uncertainty inherent in the clinical development and regulatory process, and other risks described in the Risk Factors section of Vaxart's most recently filed Annual Report on Form 10-K and other periodic reports filed with the SEC.

Vaxart undertakes no obligation to update any forward-looking statements after the date of this call. I'll now turn the call over to Andrei Floroiu.

Andrei?.

Thank you, Ed, and thank you to all of you for joining us today. On today’s call our team will highlight the progress we have made on our norovirus oral pill vaccine program during the quarter. We will also discuss updates on our plans for an oral pan-betacoronavirus vaccine and showcase data that demonstrates the unique benefits of our platform.

Starting with norovirus, most notably in the quarter, we initiated our Phase 2 dose ranging study for our bivalent norovirus oral vaccine candidate.

We remain on track to deliver on our planned milestones for 2023 with anticipated data results for both the dose ranging study and for our ongoing Phase 2 CHALLENGE study of our G11 monovalent norovirus vaccine candidate later this year.

James will provide more details on both studies in a moment, but first, a quick reminder on why this program and these studies are so important for global public health and why we're committed to Vaxart oral pill norovirus vaccine approach.

Norovirus is a significant public health issue, which leads to a significant economic burden in developed countries and there is no approved vaccine. More than 21 million people are infected in the US each year resulting in an annual disease burden of more than $10 billion in the US alone.

It is important to note that norovirus predominantly affects two age segments, children under the age of five and older adults. There are about 20 million kids in the US and about 55 million older adults over the age of 65.

Additionally, there are approximately 15 million other Americans who can benefit from a norovirus vaccine such as healthcare and childcare service providers, bringing our total domestic market opportunity to approximately 90 million Americans.

In the US, most people are concerned about salmonella or equal, but if you look at the total number of cases, norovirus is the most frequent foodborne illness by far it is been full of current events, you know that everyone is at risk for norovirus, in schools, workplaces, and many other places where people gather in large number.

People who experience norovirus symptoms are missing school and work and are not able to perform their daily functions. We believe that our norovirus vaccine program has the potential to address the need and the tremendous disease burden that norovirus carries both in the US and around the world.

Today, we have produced data from six completing norovirus clinical trials that have enrolled nearly 350 subjects. These data have shown immune responses from our vaccine to be strong, long-lasting comparable to natural infection from norovirus.

And similar in both elderly and the young adult population a result that generally is not seen with injectable vaccines. In March, we showcased our differentiated norovirus program on a virtual KOL call that we sponsored with leaders in the norovirus vaccine development.

These experts shared their insights and perspectives on the global need for a safe, effective and readily deployable norovirus vaccine. We hope that many of you were able to join this informative event as we continue to educate the financial community about the magnitude of the unmet needs and the opportunity for a norovirus vaccine.

A replay of that event is available on our Investor Relations section on our website at www.vaxart.com. Looking ahead, we have several important clinical milestones this year and we remain on track to achieve them.

First, we expect to report top-line data on the ongoing Phase 2 dose ranging study of our bivalent norovirus vaccine candidate, in mid-2023. Next, we anticipate reporting top-line data from the ongoing Phase 2 CHALLENGE study of our G11 monovalent norovirus vaccine candidate in the third quarter of this year.

And then, we look forward to initiating this year, the Bill and Melinda Gates Foundation funded clinical trial to evaluate the ability of or norovirus vaccine candidate to use antibodies in breast milk and transfer those antibodies to young infants.

Taken together, these milestones have the potential to support the continued advancement of Vaxart’s norovirus program for the safety trial, while also potentially providing further validation of the promise of our norovirus pill vaccine platform.

Norovirus continue to remain relevant, both nationally and globally and we are encouraged by this opportunity to advance our oral pill vaccine technology. Now, I'll turn the call over to James for a review of our norovirus program.

James?.

it induces broad immune responses, via both mucosal and systemic responses; immune response rates were above 90% for the high dose; immune responses were durable; they lasted for more than 200 days; vaccine responses can be boosted after one year; immune responses in the elderly, those aged 55 to 80 years in this study were very similar to those in younger adults, aged 18 to 49.

And finally, Vaxart’s norovirus vaccine has a clean safety profile and has been well tolerated in this and all of our clinical trials to-date. Next week, we will make three presentations at the 8th International Calici Virus Conference in Rotterdam, The Netherlands. Dr.

Sean Tucker, our Founder and CSO will be presenting a paper on breast, milk antibodies and the potential ability to block transmission. Dr. Becca Flitter will present data demonstrating that boost administration of our oral norovirus vaccine candidate at 18 months, after bivalent immunization is effective in inducing potent immune responses.

And lastly, I'll be presenting an overview of Vaxart’s bivalent vaccine efforts to-date, as well as providing additional details on our studies in elderly subjects. We continue to believe in the potential of our bivalent norovirus candidate as we target a BLA submission and possible FDA approval.

We look forward to updating you on our progress as we provide updates from our concurrent Phase 2 clinical trials. I'll now turn the call over to our Founder and Chief Science Officer, Dr. Sean Tucker for an update on our pan-beta Coronavirus program.

Sean?.

it is room temperature stable; it is easy to administer; it induces serum antibody responses and serum neutralizing antibody responses; it induces potent T-cell responses; it creates a mucosal immune response; it can inhibit virus transmission; it is cross reactivity in SARS-CoV-2 variants and other beta coronaviruses; and it importantly boosts the most important Covid vaccines.

Based on all of mucosal cross-reactivity data we have reported to-date in our Covid clinical vaccine studies, we believe we may be able to create oral pan-beta coronavirus vaccine. We continue to develop new constructs that enhanced pan-beta coronavirus cross-reactivity and we plan to advance these to the clinic when we are ready.

Such a vaccine would make it easy to both protect against current circulating viruses and to future-proof the vaccine either against emerging coronovirus threats or other beta coronaviruses making it a valuable tool for pandemic preparedness. We believe this approach makes tremendous sense.

There's continued interest in next-generation Covid-19 vaccines from regulatory and governmental bodies as evidenced by the Biden Administration’s reported proposed commitment of up to $5 billion for such next-generation Coronavirus vaccine.

We look forward to continuing to gauge with the government, with the goal of obtaining funding for our pan-beta coronavirus program. I'll now turn the call over to Phil for a deep discussion of the financials.

Phil?.

Thanks, Sean. The details of our financial results for the first three months of 2023 are summarized in today's press release. Vaxart ended the first quarter of 2023 with cash, cash equivalents, restricted cash and marketable securities of $71.8 million, compared to $95.7 million as of December 31st 2022.

The decrease was primarily due to cash used in operations as we advanced our norovirus program. We continue to expect our current cash position provides us with blood way into the second quarter of 2024. On behalf of all the setbacks are, I'd like to thank you for your time today. We will now open the call for your questions. .

And it looks like your first question is going to come from Mayank Mamtani B. Riley. Mayank, your line is open. .

Good afternoon team. Thanks for taking our questions. So, you seem to have a mRNA peer join in this effort, to develop a norovirus vaccine, which validates the disease burden and market opportunity that you guys have been talking for a while, And you obviously are miles ahead here in terms of being in Phase 2.

Could you just talk a little bit about the platform differences, advantages relative with your platform relative to say, mRNA? And then I have a follow-up. .

Hi Maya. Yeah, let me tell you a little bit about, obviously, I think our platform will be very good from the standpoint of listening antibody responses in mucosal surfaces and certainly norovirus is something in fact, the intestinal space. We do know we make very strong intestinal antibodies that we think we have an advantage.

As you know, mRNA vaccine can be very good at making serum antibody responses, but those tend to be a little more transient. I think our data at least in norovirus is that we can at least have our antibodies in this serum last for more than 200 days. So, I think, I think we have some significant advantages. And obviously, we're further ahead. .

Great. And then on the CHALLENGE study for the monovalent, are you guys able to sort of comment on how the sort of the expectation of events that you had when you designed the study relative to sort of where you are? And if anything else that you guys have learned as you have been executing on this study versus the original plan? That would be great.

And thanks for taking our questions. .

Why don't I take this one Sean? This is James. So your recall that CHALLENGE studies typically they're more aggressive than what you see in nature in the real world occurrence of disease. The sample size for this study is built primarily for descriptive statistical analysis. As we're really looking to understand how the vaccine operates.

To do this, we have a number of measures were looking at including, but not limited to a decrease in severity of AGE, or acute gastroenteritis, a decrease in viral shedding, effect on infectivity and effect on disease severity. .

Got it. Thanks for taking the questions. .

[Operator Instructions] Our next question is going to come from Roger Song with Jefferies. Roger, your line is open. .

Great. Thanks for the update and taking our question. A few quick ones from us.

So the first one for the bivalent immunogenicity data in the year, so can you just let us know what is the expectation for that data and the how you're going to make the go/no-go decision forward? And understanding you will potentially do a Phase 2b, what will be the potential study design for that based on the Phase 2 immunogenicity data you will see in the mid year? I have a follow-up after that.

Thank you. .

Roger. This is James. So, I'll take a stab at that. For the Phase 2, our 202 norovirus study, we're looking at the safety and immunogenicity of two different doses strengths of our bivalent to construct. And we'll take a look at both the safety, which to-date knock on wood is looking just as our portfolio has in the past well-tolerated.

But we'll also look immunogenicity and compare those two groups. I think those are sort of the two things we will look at to judge what dose to take to the larger study, the Phase 2b, so that we can get enough safety data to then have a follow-on discussion - a post Phase 2 discussion with the FDA.

And the follow-on to that study would likely take a few months. So, we would project if all successful potentially 2024. .

Got you.

And then so given you will have the CHALLENGE study data from the monovalent in 3Q as you would do the Phase 2b for the bivalent, do you expect you will also do something similar as the CHALLENGE study before moving to the pivotal or you will bring the bivalent with the larger Phase 2b manage initial data with the monovalent CHALLENGE data and moving to the Phase 3 pivotal?.

Well, I think the sequence of events are such that we will have the top-line data from the 202 study to Phase 2, just comparison study Part A mid-year. As we said in this conversation, we will have the top-line data for the CHALLENGE study in Q3 of this year. So, those two data points are fairly important as we map out our next steps.

Does that answer your question, Roger, because I'm not quite sure if I got that?.

Yeah.

Just, I think, also the question but just curious, do you need another CHALLENGE study for your bivalent before you can move into later-stage development?.

Well, I think that's a discussion to have with the regulatory agencies after we have this data in terms of additional studies, whether or not that's a requirement or not is something that we will be talking to the agency about. .

Got it. Thank you. .

Okay. That concludes the audio portion of the Q&A. So I'll now turn it over to Ed Berg for the written Q&A. .

Thank you. We've had a number of online questions. James, this first question is for you.

Did you have additional discussions with the FDA this quarter? And if so, what was the context of those discussions if any?.

Thanks Ed. We had not planned for formal discussions with the FDA this past quarter and really haven't had a need for a new discussions in the past quarter. But we do plan for a post-Phase 2 meeting with the FDA once the larger Phase 2b study is completed as I mentioned to Roger. .

Thank you. Also, on the subject of norovirus, this question is for Sean.

How important is identifying correlative protection to the overall norovirus program? And a follow-up question too, what could identifying those correlates tell you about the vaccine candidate and probability of success in Phase 3?.

Yeah, thanks, Ed. Yeah, certainly understanding what immune parameters are reflective of success it’s important for speeding up the clinical development – it helps you know what to look for in late-stage trials and help you understand if there's any change you make in dose and vaccination schedule can possibly impact efficacy.

Of course, this is not a path to have, but it's certainly nice to have, because it can’t beat up your trials, and definitely reduce the size of your - and your Phase 3 study. .

Thanks, Sean. We have one more question on the norovirus program. This one is for James.

Would herd immunity have a role for norovirus if you vaccinate infants, would adults be protected over time?.

Yeah, that's an interesting question. It's, unknown how norovirus infectivity and spread would be affected by the vaccine because, as you know, there's no currently approved vaccine out there. However, there are several studies that inform us that show that if you vaccinate young children, you also improve the health of adults.

There's a relatively well-known study out of Japan that showed when young children were vaccinated for influenza, the rate of deaths for all causes – or all caused mortality in the elderly population decreased significantly.

Now you might not be able to protect against all Illness, but we know that children acquire disease and then transmit to their families. And that's a portion of global health that we hope to address. .

Thank you. We have a question. The next question is on the coronavirus. The Covid program we have. And that actually is, I think Sean and Andre, you might want to answer this.

The question is that the Washington Post reported on the Biden Administration’s RFI for next-generation Coronavirus vaccines and the report referenced potential $5 billion in funding.

Does the Biden Administration next-gen vaccine proposal change at all, how you're thinking about the pan-beta coronavirus program that you referenced in the call?.

Yeah, it's a good question. Again, the report of potential funding for next-generation vaccines is a positive definite. I don't think the announcement changes our approach. But it is probably reflected with the consensus of the scientific community that improvements to the current vaccine can be made.

Andrei?.

Yeah, and yeah, what I was asked, what Sean said is that, we see these progress from the Biden Administration as confirmation our approach and as people that have read the RF I can kind of test. We see like the requirements and the focus on mucosal immunity is still very well our platform.

So we are quite encouraged by this initiative and we're looking forward to seeing how we can participate in it. .

Thank you. Andrei. One final question. This one is for Sean. Again on Covid.

Do you have a timeline for advancing a pan-beta coronavirus vaccine candidate at the clinic?.

Yes, I mean, certainly we are continuing to develop newer candidates in constructs in research which we believe having increased potential to make a potent pan-beta coronavirus vaccine. We're not providing any guidance at this time. Again, timing depends on multiple factors. .

Okay. That's all the questions we have. I'll turn it back over to the operator. .

Okay. Thank you. This concludes your call. You may now disconnect and thank you again for joining..