LIMITED POWER OF ATTORNEY FOR

SECTION 16 REPORTING PURPOSES



Know all by these presents, that the undersigned hereby makes, constitutes and appoints

Elizabeth Czerepak and Ori Solomon, each acting individually, as the undersigned's true

and lawful attorneys-in-fact, with full power and authority as hereinafter described on behalf

of and in the name, place and stead of the undersigned to:



(1) execute for, and on behalf of, the undersigned, in the undersigned's capacity as an

officer, director and/or 10% beneficial owner of Altimmune, Inc. (the "Company"), Forms 3, 4,

and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules

and regulations promulgated thereunder (the "Exchange Act");



(2) seek or obtain, as the undersigned's representative and on the undersigned's behalf,

information on transactions in the Company's securities from any third party, including

brokers, employee benefit plan administrators and trustees, and the undersigned hereby

authorizes any such person to release any such information to any attorney-in-fact and further

approves and ratifies any such release of information;



(3) do and perform any and all acts for and on behalf of the undersigned that may be

necessary or desirable to prepare, complete and execute any such Form 3, 4 or 5, and any

amendments thereto, or other required report and timely file such Forms or reports with the

United States Securities and Exchange Commission (the "Commission"), the NASDAQ and

any stock exchange or similar authority as considered necessary or advisable under Section

16(a) of the Exchange Act (including, without limitation, executing and delivering a Form ID

to the Commission to obtain EDGAR filing codes); and



(4) take any other action of any type whatsoever in connection with the foregoing which, in

the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally

required by, the undersigned, it being understood that the documents executed by such attorney-

in-fact on behalf of the undersigned pursuant to this Limited Power of Attorney shall be in

such form and shall contain such terms and conditions as such attorney-in-fact may approve

in such attorney-in-fact's sole discretion.



The undersigned hereby gives and grants to each such attorney-in-fact full power and

authority to do and perform any and every act and thing whatsoever requisite, necessary, or

proper to be done in the exercise of any of the rights and powers herein granted, as fully to

all intents and purposes as the undersigned might or could do if personally present, with full

power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-

fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be

done by virtue of this power of attorney and the rights and powers herein granted.



The undersigned hereby acknowledges that (a) the foregoing attorneys-in-fact are serving

in such capacity at the request of the undersigned; (b) this Limited Power of Attorney

authorizes, but does not require, each such attorney-in-fact to act in his or her discretion

on information provided to such attorney-in-fact without independent verification of such

information; (c) any documents prepared and/or executed by any attorney-in-fact on behalf

of the undersigned pursuant to this Limited Power of Attorney shall be in such form and shall

contain such information and disclosure as such attorney-in-fact, in his or her sole

discretion, deems necessary or advisable; (d) neither the Company nor any attorney-in-fact

assumes (i) any liability for the undersigned's responsibility to comply with the requirements

of the Exchange Act, (ii) any liability of the undersigned for any failure to comply with such

requirements or (iii) any obligation or liability of the undersigned for profit disgorgement

under Section 16(b) of the Exchange Act; and (e) this Limited Power of Attorney does not

relieve the undersigned from responsibility for compliance with the undersigned's obligations

under the Exchange Act, including, without limitation, the reporting requirements under

Section 16 of the Exchange Act.



This Limited Power of Attorney shall remain in full force and effect until the undersigned

is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings

of, and transactions in, securities issued by the Company, unless earlier revoked as to any

attorney-in-fact by the undersigned in a signed writing delivered to such attorney-in-fact.



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be

executed as of this 6th day of June, 2017.



/s/ John M Gill

John M Gill