黄热病 B型肝炎

B型肝炎是一种由乙型肝炎病毒（HBV）引起的肝脏疾病。它的严重程度不一，从轻微的疾病，到持续数周的急性疾病，直至可导致肝病或肝癌的严重长期慢性疾病。

B型肝炎如何传播？

它可通过以下方式传播：接触受感染的血液、精液、与受感染者发生性行为而产生的其他体液、共用受污染的针头注射药物，与受感染者共用包括剃刀与牙刷在内的物品、或由受感染的母亲传播给其新生儿。

慢性B型肝炎是一种严重的疾病，可导致许多长期的健康问题，包括肝损伤，肝功能衰竭，肝癌，甚至死亡。因此，我们建议公众注射此疫苗。

目前，医界没有发现治疗此疾病的方法。因此，接受B型肝炎疫苗是预防它的最好办法。现在，在新加坡出生的所有儿童都接受B型肝炎疫苗接种。

Laboratory diagnostic tests are not perfect and are not 100% accurate

We do not have a test for every disease or virus but most of those pathogens that are of public health importance or have long term implications on your health can be tested
No one single test can be used with absolute certainty to diagnose a disease. Often, we depend on a combination of tests to make a diagnosis
Sometimes, we have to resort to trial treatment or empiric treatment if investigative tests are inconclusive. If the patient makes a therapeutic response and feels better, we have achieved our goal
In PUO, we are looking for treatable causes and to rule out sinister causes eg. malignancies so that we do not miss opportunities for early treatment or intervention