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我是说申请短期的医疗签证，是不是不影响正在申请中的移民签证吧，
-Not affect it. If the VO asks her immigration application/intent, she needs to explain to the VO that although she is applying for the immigration into US , she will come back to China to apply for the immigration visa after her illness is treated in US. Thus, the VO may issue her the visitor visa for medical treatment.

可以同时进行吗？
-Yes.

医疗签证的时间会很快吗？
-Yes.