Table 1. Average water concentrations (ng L−1) of oseltamivir carboxylate (OC) measured in Kyoto (R1–R4) and Osaka (R5–R6) prefectures, Japan.
Date | Week | Kamo River | Katsura River | Yodo River | |||
R1 | R2 | R3 | R4 | R5 | R6 | ||
2007-06-13 | nd | nd | - | nd | - | - | |
2007-12-17 | 50 | - | 2 | - | 7 | - | - |
2008-02-04 | 5 | 2 | 4 | - | 11 | - | - |
2008-02-12 | 6 | - | 4 | 19 | 10 | ||
2008-02-15 | 6 | - | - | - | - | 12 | 58 |