But that doesn't always work because the bacteria or virus may not be present in the blood or other easily accessible area.
但是这个方法常常不会凑效，因为病原不会总是出现在血液或者其他容易被发现的地方。
The results showed that there is 6.3% dead larvae caused by infection of pathogenic fungi in EAB nature population, no finding that of pathogenic bacteria or virus.
通过在洋白蜡和水曲柳等受害林地进行解剖调查，发现白蜡窄吉丁自然种群中幼虫的自然感病死亡率为6.3％，均为真菌感染，没有发现病原细菌和病毒感染致死的情况。
HIV is hard to transmit because lots of bacteria or virus has to have direct contact with susceptible tissues and it is not possible to carry enough bacteria on the hands.
HIV是很难传播的因为细菌和病毒必须直接和易被感染的细胞组织接触，但在手上没有可能带来足够多的病毒。
"For each bacteria or virus that has been sequenced anywhere in the world, we have several dozen squares on the checkerboard that will identify sequences from that organism," Slezak explained.
“对于世界上每种已被测序的细菌或病毒，载玻片棋盘格子中的一些方格都将会识别该生物体的DNA序列，”Slezak解释道。
Even if early man could not see virus or bacteria, he was confronted with their lethal impact.
即使早期人类无法见到病毒或细菌，也面临着其致命影响。
Moreover, he doubts the value of one or more probiotic bacteria that even in high concentrations only inhibit 30 to 50 percent of the virus.
他还怀疑一种或多种益生菌的价值，即使是高浓度也只能抑制30%到50%的病毒。
Biological preparations composed either of a harmless variety of a disease-causing agent such as a virus or bacteria, or of proteins derived from such an agent.
由无害的多种致病介质如病毒或细菌或来自这些介质的蛋白质组成的生物制品。
When a child catches the flu, or another virus that causes an upper respiratory infection, the bacteria seize the opportunity and migrate to the middle ear, causing a secondary infection.
当一个孩子患上流感或另一种病毒引起的上呼吸道感染，这种细菌就抓住这个机会移行到中耳并导致继发感染。
When the body is under attack from harmful micro-organisms be it a virus, cancer, or bacteria the immune system will go into action to deal with the invaders.
如果机体受到有害的微生物威胁时，比如病毒、癌细胞或者细菌，免疫系统就会发起免疫作用对抗这些入侵者。
Furthermore, infection with a virus or bacteria may irritate the nasal linings.
此外，病毒或细菌感染可能会刺激鼻腔衬里。
Traditionally, researchers have looked for clues to an infection by tracking down the virus or bacteria causing it.
传统的，研究者们通过追踪病原菌和病毒来发现感染的线索。
Virus: Microscopic, simple infectious agent that can multiply only in living cells of animals, plants, or bacteria.
病毒：微小、简单的传染因子，仅在动物、植物、细菌的活细胞中能够繁殖。
Phages are a special kind of virus because they only infect and kill bacteria. They don't infect humans or other animals.
噬菌体是一种特殊的病毒，它只会感染和杀死细菌，不会感染人类或其它动物。
Original conceal takes the advantage of empty in the virus of nose pharynx ministry, bacteria and enter, many breed rises, cause a cold or cause bronchitic wait for a disease.
原来潜伏在鼻咽部的病毒、病菌就趁虚而入，并大量繁殖起来，引起感冒或诱发支气管炎等疾病。
Dear Patient: GASTROENTERITIS Gastroenteritis means inflammation of the stomach and intestines. It may be caused by bacteria, virus or by irritation caused by toxins in food or drink.
肠胃炎 肠胃炎是指小肠及胃发炎， 主要是由于进食或饮用受细菌、病毒或毒素所沾染的食物或饮水而引起，常见徵状可能包括恶 心、呕吐、腹泻及胃部痛性痉孪。
Dear Patient: GASTROENTERITIS Gastroenteritis means inflammation of the stomach and intestines. It may be caused by bacteria, virus or by irritation caused by toxins in food or drink.
肠胃炎 肠胃炎是指小肠及胃发炎， 主要是由于进食或饮用受细菌、病毒或毒素所沾染的食物或饮水而引起，常见徵状可能包括恶 心、呕吐、腹泻及胃部痛性痉孪。
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