Acknowledgments
We thank Balai Besar Teknik Kesehatan Lingkungan dan Pengendalian Penyakit, Yogyakarta (BBTKL-PP) and Balai Besar Veteriner (BBVet), Wates, Yogyakarta for providing the NGS Illumina MiSeq instrument facility to sequence the virus isolates. We thank the Collaborator Members of the Yogyakarta-Central Java Covid-19 study group: Fatin Asfarina, Sri Fatmawati, and Sumartinigsih (Integrated Research Laboratory, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada [FKKMK UGM]), Sumardi, Heni Retnowulan, Eko Budiono, Bambang S. Riyanto, Satria Maulana, Munawar Gani, Osman Sianipar, Ira Puspitawati, (FKKMK UGM/Dr. Sardjito General Hospital), Herdiyanto Mulyawan and Lestari (BBVet Wates, Yogyakarta), Havid Setyawan and Indaryati (BBTKL-PP, Yogyakarta), Muhammad T. Soekarno and Safitriani (PT. Pandu Biosains). We gratefully acknowledge the authors, the originating, and submitting laboratories for their sequences and metadata shared through GISAID platform. Our study was financially supported by the Ministry of Health, Indonesia and Dr. Sardjito General Hospital. The funders had no role in study design, data collection and analysis, as well as manuscript preparation.