; and (D) by amending paragraph (6) to read as follows: (6) Number of grants A political subdivision or a consortium of political subdivisions may not receive more than one grant under paragraph (1). ; and (3) in subsection (d), by striking Amounts appropriated under subsection (f) and inserting Amounts appropriated to carry out this section . (b) Epidemiology-Laboratory capacity grants Section 2821 of the Public Health Service Act ( 42 U.S.C. 300hh–31 ) is amended— (1) in subsection (a)(1), by inserting , including mosquito and other vector-borne diseases, after infectious diseases ; and (2) by amending subsection (b) to read as follows: (b) Authorization of appropriations There are authorized to be appropriated to carry out this section $40,000,000 for each of fiscal years 2019 through 2023. . (c) GAO study (1) Study The Comptroller General of the United States shall conduct a study on the state of surveillance and control of mosquito-borne infectious diseases in the United States, including Indian Country (as defined in section 1151 of title 18, United States Code) and territories, including the state of preparedness for conducting such surveillance and control. The study shall include— (A) a description of the infrastructure and programs for mosquito control in the United States (including Indian Country (as so defined) and such territories), including— (i) how such infrastructure and programs are organized and implemented at the Federal, State and local levels, including with respect to departments and agencies of the States, and local organizations (including special districts) involved in such control programs; (ii) the role of the private sector in such activities; (iii) how the authority for mosquito control impacts such activities; and (iv) the funding sources for such infrastructure and programs, including Federal, State, and local funding sources