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Ch. 19 - Digestive System Infections
Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Norman-McKay 2nd EditionCh. 19 - Digestive System Infections문제 1
15장, 문제 1

Compare and contrast hepatitis A and B viruses.

검증된 단계별 안내
1
Identify the classification and structure of each virus: Hepatitis A virus (HAV) is a non-enveloped, single-stranded RNA virus belonging to the Picornaviridae family, whereas Hepatitis B virus (HBV) is an enveloped, partially double-stranded DNA virus from the Hepadnaviridae family.
Examine the modes of transmission: HAV is primarily transmitted via the fecal-oral route, often through contaminated food or water, while HBV is transmitted through blood and bodily fluids, including sexual contact, needle sharing, and perinatal transmission.
Compare the clinical course and disease outcomes: HAV infection usually causes an acute, self-limiting hepatitis without chronic infection, whereas HBV can cause both acute and chronic hepatitis, with chronic infection potentially leading to cirrhosis and hepatocellular carcinoma.
Discuss the immune response and vaccination: HAV infection typically results in lifelong immunity after recovery, and an effective inactivated vaccine is available; HBV infection also induces immunity, but chronic carriers exist, and a recombinant vaccine is used for prevention.
Highlight diagnostic markers: HAV infection is diagnosed by detecting anti-HAV IgM antibodies indicating recent infection, while HBV diagnosis involves detecting hepatitis B surface antigen (HBsAg), antibodies to core antigen (anti-HBc), and other serological markers to distinguish acute, chronic, or resolved infection.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Virus Classification and Structure

Hepatitis A virus (HAV) is a non-enveloped, single-stranded RNA virus from the Picornaviridae family, while Hepatitis B virus (HBV) is an enveloped, partially double-stranded DNA virus from the Hepadnaviridae family. Understanding their structural differences helps explain their modes of transmission and stability in the environment.
추천 영상:
가이드 코스
02:33
Introduction to Animal Virus Infections

Transmission and Epidemiology

HAV is primarily transmitted via the fecal-oral route, often through contaminated food or water, leading to acute infections. HBV spreads mainly through blood, sexual contact, and perinatal exposure, and can cause both acute and chronic infections, influencing public health strategies.
추천 영상:
가이드 코스
04:23
Transmission Electron Microscope (TEM)

Clinical Manifestations and Outcomes

Hepatitis A typically causes an acute, self-limiting liver infection without chronic disease, whereas Hepatitis B can lead to chronic hepatitis, cirrhosis, and hepatocellular carcinoma. Recognizing these differences is crucial for diagnosis, treatment, and prevention.
추천 영상:
가이드 코스
09:16
Outcomes of Antibody Binding to Antigen
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Which one of the following measures is the most effective way to prevent viral infections of the digestive system?

a. Antibiotics

b. Thoroughly cooking food

c. Decontaminating water

d. Washing hands

e. Disinfecting bathroom surfaces

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교과서 질문

Which of the following can occur even if the infectious agent is killed by the time it enters the host?

a. Salmonellosis

b. Cholera

c. Giardiasis

d. Food poisoning

e. Mumps

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How would an upper endoscopy help diagnose a Helicobacter pylori infection?

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