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Table 2 Variations in the chloroquine resistance of P. falciparum (In vitro)

From: Surveillance of antimalarial drug resistance in China in the 1980s–1990s

Province Year No. of cases examined Resistance rate(%) Mean inhibition concentration(pmoll)* > 6.4 pmoll** (%)
Hainan 1981 48 97.7 10.46 ± 7.14 83.3
1997 45 26.7 1.63 ± 1.17 6.7
Yunnan 1981 39 97.4 17.2 ± 12.6 58.9
1999 18 77.8 4.4 ± 3.1 19.5
  1. *The mean drug concentration for complete inhibition of schizont maturation.
  2. **Percentage of cases with complete inhibition of schizont maturation.