Thank you, Paul. Good afternoon, everyone. We appreciate you joining the call. I'll start on slide 12 and touch on a few key financial highlights before walking through the first quarter details. First, as Bob noted, we anticipate closing on the divestiture of the Travel Health business in the second quarter, which will provide an infusion of upfront cash while furthering our stated objective of sharpening our strategic focus. The impact of the sale is now incorporated into our updated guidance for 2023 and enables us to better align our cost structure with our current revenue trajectory. Second, as you heard from both Bob and Paul, we continue to see robust demand for NARCAN nasal spray in both the US public interest and Canadian markets, and that is reflected in our first quarter results. These trends are leading us to significantly increase our NARCAN revenue guidance for this year. In addition, our NARCAN guidance also continues to reflect our assumptions regarding the impact of over-the-counter sales, which we are planning to initiate beginning in late summer. Third, the US government has recently provided us with notices of intent to procure quantities of ACAM, bat and BIG that all align with our prior expectations. Fourth, we are adjusting down our CDMO revenue guidance driven principally by recent changes to customer requirements for COVID-related products we were manufacturing. These impacts, along with continued remediation costs and other investments to improve quality and compliance across our entire manufacturing network negatively affected first quarter adjusted gross margin and have a corresponding ripple effect on our updated full year adjusted gross margin forecast. Calendar 2023 will continue the process of rebuilding this business, readying our manufacturing capacity and positioning it for growth in the future. Lastly, we are in the final stages of reaching agreement with our bank group to amend certain terms of our credit facility, including an extension of the October 2023 maturity date. We anticipate closing this amendment on or before May 17, and we'll provide additional details at that time. With that, let's now turn to a review of our financial results, which can be found on slides 13, 14 and 15. Highlights include total revenues of $165 million, a decrease over the prior year, driven by lower sales of our key medical countermeasure products and substantially reduced CDMO services revenue offset by better-than-anticipated NARCAN sales in the quarter. And as expected, our key profitability measures declined versus the prior year with net loss of $183 million, adjusted net loss of $159 million and adjusted EBITDA of negative $101 million. Notable revenue elements in the quarter include: Anthrax MCM sales of $22 million lower than the prior year due to timing of deliveries of AV7909 and BioThrax to the US government's Strategic National Stockpile, offset by increased sales of Anthrasil. NARCAN sales of $100 million higher than the prior year, demonstrating the continuing durability of this product driven by consistently strong demand from the US PIC channel and the growing market in Canada. Smallpox MCM sales of $7 million lower than the prior year due to timing of ACAM2000 international sales. Other product sales of $14 million, slightly higher year-over-year, reflecting increased sales of Vaxchora and Vivotif as well as the timing impact of several other products and combined CDMO service and lease revenues of $15 million. Significantly lower than the prior year due to lower production activities in certain of our sites as we continue to support existing customers and rebate find the business following our COVID-19 response. Turning to operating expenses. Cost of product sales in the quarter were $103 million, higher than the prior year and driven primarily by lower overhead absorption, combined with higher allocations of product COGS at our Bayview facility, offset by lower period costs at our burn facility and lower NARCAN royalty costs. Cost of CDMO was $52 million, significantly lower than the prior year due to reduced production across the CDMO network, partially offset by higher cost at the Camden site, resulting from additional investments and quality improvement initiatives. R&D expense of $41 million lower than the prior year due primarily to lower spending on the CHIP program and SG&A spend of $101 million higher than the prior year, largely due to professional services supporting transformation activities and onetime costs related to the previously announced employee reductions. With that, let's move to slide 16 and review segment performance during the quarter. In the Products segment, revenues were $143 million, a decrease in the prior year as strong performance from NARCAN was offset by lower contribution from both Anthrax MCM and smallpox MCM sales. And adjusted gross margin was $44 million or 31%, both decreases over the prior year, reflecting lower sales volume, a less favorable product mix and the higher cost of product sales I just discussed. As for the services segment, revenues were $15 million, a significant decrease from the prior year, and adjusted gross margin was negative $37 million, a decrease versus the prior year driven primarily by declining services revenues related to the COVID-19 response, coupled with incremental costs associated with facility remediation efforts and investments in quality and compliance across our manufacturing network. Moving on to slide 17, I'll touch on select balance sheet and cash flow highlights. We ended the first quarter with $430 million in cash, down sequentially from December 31. Operating cash flow was negative in the quarter due primarily to lower MCM and CDMO revenues. As we said previously, we expect the contribution of revenues, earnings and operating cash flow to be weighted to the second half of the year. Capital expenditures in the period were $15 million. And as of March 31, our net debt position was $975 million. Please turn to slides 18 and 19 for a review of our 2023 forecast and associated assumptions. As announced in our press release this evening, we're updating our guidance for full year 2023 as follows; importantly, our revised guidance reflects the impact of the previously announced sale of our travel health business to Bavarian Nordic, which we anticipate to close in the second quarter. Total revenues of $1.1 billion to $1.2 billion, unchanged from prior guidance. Anthrax MCM sales of $260 million to $280 million, also unchanged from prior guidance. NARCAN nasal spray sales of $360 million to $380 million, an increase over the prior guidance primarily reflecting robust demand from the US public interest channel and the Canadian market. Smallpox MCM sales of $235 million to $255 million, unchanged from prior guidance. Other product sales of $120 million to $140 million, lower than prior guidance, primarily reflecting the removal of travel health products following the anticipated completion of the divestiture. CDMO services revenue of $90 million to $110 million, a decline from the prior guidance range for the reasons I highlighted earlier, adjusted net loss of $85 million to $35 million, slightly lower versus the prior range, reflecting the impact of higher NARCAN sales and the impact of the Travel Health divestiture, offset by lower CDMO revenues and an increase to our tax valuation allowance. Adjusted EBITDA of $100 million to $150 million higher than the prior range, primarily reflecting the impact of the Travel Health business divestiture as well as the upward revision to NARCAN, offset by the ongoing process of re-baselining the CDMO business and adjusted gross margin of 39% to 42%, slightly lower than the prior range and reflecting the impact of overall revenue mix. Finally, we are guiding to second quarter revenues of $210 million to $230 million, further emphasizing our anticipation that revenues and profits in 2023 will be more heavily weighted towards the second half of the year. To conclude, please turn to slide 20 for some summary comments. Our results in the first quarter once again reflect a mix of strong performance in certain core areas of our business, offset by ongoing challenges in other aspects of our business. We are committed to sustaining revenue growth and improving profitability, and we are addressing near-term challenges to our credit profile. Finally, as always, we remain confident in the impact we are having on patients and customers focused on health security and pandemic preparedness. That completes my prepared remarks, and I'll now turn the call over to the operator so that we can start the question-and-answer session. Operator?