It was calculated that the minimum carrying rate with F. tularensis in H. longicornis from Helan town was 2.12%.
由此推算，河栏镇长角血蜱对于土拉菌的最小携带率为2.12%。
2
The parthenogenesis population of Haemaphysalis longicornis Gansu strain in northern China was observed under laboratory conditions. Three hosts were needed in one generation.