RT Book, Section A1 Murtagh, John A1 Rosenblatt, Jill A1 Coleman, Justin A1 Murtagh, Clare SR Print(0) ID 1157239126 T1 Baffling viral and protozoal infections T2 Murtagh's General Practice, 7e YR 2018 FD 2018 PB McGraw-Hill Australia Pty Ltd PP Sydney, Australia SN 9781760422295 LK murtagh.mhmedical.com/content.aspx?aid=1157239126 RD 2024/04/19 AB It is certainly a one-sided opinion—even though generally adopted at the moment—that all infectious agents which are still unknown must be bacteria. Why should not other microorganisms just as well be able to exist as parasites in the body of animals?ROBERT KOCH (1843–1910), ZURUNTERSUCHUNG VONPATHOGENENORGANISMEN (1881)