TY  - BOOK
AU  - De Vera- Ruiz,Elaine
TI  - Delta variant threat may affect herd immunity target - OCTA
KW  - Delta variant
KW  - OCTA
KW  - herd immunity
KW  - COVID19
KW  - COVID 19
KW  - COVID-19
UR  - http://elibrary.doh.gov.ph/cgi-bin/koha/opac-retrieve-file.pl?id=53356e9d6c0946cc5e2ba8f2a0315475
ER  -