Exclusion criteria:
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1. Participants with abnormal and clinically significant results of physical exam, blood routine test, coagulation function, blood biochemistry, urine routine test, chest X-ray, electrocardiography, B ultrasound for abdomen, hepatitis B virus markers etc..Participants with active HCV antibody, HIV antibody, treponema pallidum specific antibody;
2. Participants with the following clinically significant diseases in the near 3 months (including but not limited to cardiovascular diseases, pulmonary diseases, renal diseases, gastroenterology diseases, liver diseases, metabolism diseases, hematopathy diseases, endocrinology diseases, tumors, immue diseases, neurology diseases);
3. Participants with a history of mental problems, drug abuse, drug dependence;
4. Participants with dysphagia, or those who can't follow the same diet (for example high-fat, high calorie diet intolerance);
5. Participants with allergies: such as those who are allergic to two or more drugs or foods; or those who are allergic to TAF or its ingredients;
6. Participants with drinking tea or coffee or caffeine in excess (more than 8 cups one day, 1 cup = 250mL) within the past 6 months; participants who intook any beverages or foods containing caffeine (like coffee, strong tea, chocolae etc.) within 48 hours before taking the first dose of the study;
7. Participants with positive results of breath alcohol test or often drinking (drinking more than 14 standard unit one week) before participating the study; participants with drinking more than 14 unit one week (1 unit = 360mL beer or 45mL liquor containing 40% alcohol or 150mL wine); participants with intaking any alcoholic products within 24 hours before taking the drugs of this study;
8. Participants with taking any medicine within 14 days before taking the first dose of the study, or taking medicine which has drug-drug interation with TAF within 30 days before taking the first dose of the study;
9. Participants who couldn't tolerate venipuncture;
10. Participants who participated other clinical trials within 3 monthns before taking the first dose of the study;
11. Participants who donated blood or had a massive bleeding (bleeding volume>450mL);
12. Participants who had undergone a surgery within 4 weeks before participating this study, or intend to undergo a surgery during the study period or within 2 weeks after the end of the study;
13. Participants with positive results of drug screening (morphine, tetrahydro-cannabivarinic acid, methamphetamine, dimethyl oxygen-amphetamine, ketamine);
14. Participants with a history of heaving smoking (heavy smoking means that one person who on average, smoke≥3 cigarettes one day in the near 3 months);
15. Pregnant or lactating women, and men or women or their partners who plan to get pregnant during the study period or within 3 months after the end of the study, or participants who are unwilling to use non-drug contraception (like abstinence-only, using an intrauterine device, partner ligature etc.);
16. The investigators judge that the participants are not suitable to enroll in the study.
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