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HIV検査の流れ

HIV感染症の診断にはまず、高感度のスクリーニング検査を行う。スクリーニング検査には偽陽性があるため、陽性の場合は必ずウェスタンブロット法(WB)法とHIV-RNA量による確認検査を行う。
出典
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1: 日本エイズ学会 HIV感染症治療委員会:HIV感染症「治療の手引き」第21版、2017;p7.

HIV感染の自然経過

HIV感染後のウイルス量とCD4値の自然経過および病期との関係
出典
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1: 日本エイズ学会HIV感染症治療委員会:HIV感染症「治療の手引き」第21版.2017;p6.

エイズ指標疾患

HIV感染症の診断を受け、指標疾患の診断を受けていると、エイズの診断基準を満たす。
出典
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1: [http://www.mhlw.go.jp/bunya/kenkou/kekkaku-kansenshou11/01-05-07.html 厚生労働省:後天性免疫不全症候群]2018年3月31日アクセス。

急性HIV感染症にみられる症状とその頻度

急性HIV感染症では、伝染性単核球症やインフルエンザなど、他の疾患と似た症状を起こすことがある。リスクのある者がこれらの症状で受診した場合、HIV検査を検討する。
出典
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1: Guidelines for using antiretroviral agents among HIV-infected adults and adolescents.
著者: Mark Dybul, Anthony S Fauci, John G Bartlett, Jonathan E Kaplan, Alice K Pau, Panel on Clinical Practices for Treatment of HIV
雑誌名: Ann Intern Med. 2002 Sep 3;137(5 Pt 2):381-433.
Abstract/Text: The availability of an increasing number of antiretroviral agents and the rapid evolution of new information have introduced substantial complexity into treatment regimens for persons infected with human immunodeficiency virus (HIV). In 1996, the Department of Health and Human Services and the Henry J. Kaiser Family Foundation convened the Panel on Clinical Practices for the Treatment of HIV to develop guidelines for clinical management of HIV-infected adults and adolescents (CDC. Report of the NIH Panel To Define Principles of Therapy of HIV Infection and Guidelines for the use of antiretroviral agents in HIV-infected adults and adolescents. MMWR. 1998;47[RR-5]:1-41). This report, which updates the 1998 guidelines, addresses 1) using testing for plasma HIV ribonucleic acid levels (i.e., viral load) and CD4+ T cell count; 2) using testing for antiretroviral drug resistance; 3) considerations for when to initiate therapy; 4) adherence to antiretroviral therapy; 5) considerations for therapy among patients with advanced disease; 6) therapy-related adverse events; 7) interruption of therapy; 8) considerations for changing therapy and available therapeutic options; 9) treatment for acute HIV infection; 10) considerations for antiretroviral therapy among adolescents; 11) considerations for antiretroviral therapy among pregnant women; and 12) concerns related to transmission of HIV to others. Antiretroviral regimens are complex, have serious side effects, pose difficulty with adherence, and carry serious potential consequences from the development of viral resistance because of nonadherence to the drug regimen or suboptimal levels of antiretroviral agents. Patient education and involvement in therapeutic decisions are critical. Treatment should usually be offered to all patients with symptoms ascribed to HIV infection. Recommendations for offering antiretroviral therapy among asymptomatic patients require analysis of real and potential risks and benefits. In general, treatment should be offered to persons who have <350 CD4+ T cells/mm3 or plasma HIV ribonucleic acid (RNA) levels of >55,000 copies/mL (by b-deoxyribonucleic acid [bDNA] or reverse transcriptase-polymerase chain reaction [RT-PCR] assays). The recommendation to treat asymptomatic patients should be based on the willingness and readiness of the person to begin therapy; the degree of existing immunodeficiency as determined by the CD4+ T cell count; the risk for disease progression as determined by the CD4+ T cell count and level of plasma HIV RNA; the potential benefits and risks of initiating therapy in an asymptomatic person; and the likelihood, after counseling and education, of adherence to the prescribed treatment regimen. Treatment goals should be maximal and durable suppression of viral load, restoration and preservation of immunologic function, improvement of quality of life, and reduction of HIV-related morbidity and mortality. Results of therapy are evaluated through plasma HIV RNA levels, which are expected to indicate a 1.0 log10 decrease at 2-8 weeks and no detectable virus (<50 copies/mL) at 4-6 months after treatment initiation. Failure of therapy at 4-6 months might be ascribed to nonadherence, inadequate potency of drugs or suboptimal levels of antiretroviral agents, viral resistance, and other factors that are poorly understood. Patients whose therapy fails in spite of a high level of adherence to the regimen should have their regimen changed; this change should be guided by a thorough drug treatment history and the results of drug-resistance testing. Because of limitations in the available alternative antiretroviral regimens that have documented efficacy, optimal changes in therapy might be difficult to achieve for patients in whom the preferred regimen has failed. These decisions are further confounded by problems with adherence, toxicity, and resistance. For certain patients, participating in a clinical trial with or without access to new drugs or using a regimen that might not achieve complete suppression of viral replicatioing a regimen that might not achieve complete suppression of viral replication might be preferable. Because concepts regarding HIV management are evolving rapidly, readers should check regularly for additional information and updates at the HIV/AIDS Treatment Information Service website ( http://www.hivatis.org ).
Ann Intern Med. 2002 Sep 3;137(5 Pt 2):381-433.

好酸球性膿疱性毛包炎

  1. 好酸球性膿疱性毛包炎はHIV感染者により高頻度にみられる、瘙痒感の強い丘疹である。
  1. 主に体幹、顔面などにみられる。
  1. CD4値250未満など、やや進行した患者にみられる。
出典
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1: Eosinophilic folliculitis in 2 HIV-positive women.
著者: Benjamin B Hayes, Rachel C Hille, Lynne J Goldberg
雑誌名: Arch Dermatol. 2004 Apr;140(4):463-5. doi: 10.1001/archderm.140.4.463.
Abstract/Text: BACKGROUND: Human immunodeficiency virus-associated eosinophilic folliculitis (HIV-EF) among homosexual men is a commonly reported dermatologic finding, while only 4 cases in HIV-positive women have been documented in the literature to date. This article describes 2 additional cases of HIV-EF in immunocompromised women and reviews the data on this condition.
OBSERVATIONS: The diagnoses were made on the basis of clinical appearance and microscopic analysis of skin biopsies. The women were not receiving highly active antiretroviral therapy (HAART) and their CD4 cell counts were below 100/ micro L.
CONCLUSIONS: As HIV prevalence continues to increase in the female population, more cases of HIV-EF will be seen among women. Because the etiology of HIV-EF remains elusive, no single treatment stands above the rest although several successful therapies have been demonstrated. However, HAART restores the proper T-cell milieu, which seems to improve the course of this disease.
Arch Dermatol. 2004 Apr;140(4):463-5. doi: 10.1001/archderm.140.4.463....

脂漏性皮膚炎

  1. 脂漏性皮膚炎は、HIV感染者により高頻度にみられる皮膚所見であり、CD4の低下とともに重症度が増すとされている。
  1. 額、眉毛、鼻翼部、口囲を中心に落屑を伴う紅斑としてみられる。
出典
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1: Habif: Clinical Dermatology, 6th Ed. Mosby, Figure 8-39 An imprint of Elsevier, 2016.

HIVウイルス

HIV粒子の構造

HIVの急性感染期の自然経過を示すFiebig分類

HIV-1感染からの日数の経過と各種検査で検出可能となるものの関係を示す。
出典
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1: Cohen MS, Gay CL, Busch MP, Hecht FM. The detection of acute HIV infection. J Infect Dis. 2010; 202(S2):S270-S277. Pubmed ID: 20846033

HIV陽性(CD4値200未満)の結核患者の胸部X線像例

CD4値が200未満のHIV感染者で結核を発症した例。結核に定型的とされる肺上部の病変ではなく、この症例のように「下肺の陰影」など非定形的なX線像を呈することもある。
出典
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1: Lee Goldman MD,Andrew I. Schafer MD: Goldman’s Cecil Medicine 25th ed.Philadelphia: Saunders, An imprint of Elsevier,2016. FIGURE 391-5 

HIV検査の流れ

HIV感染症の診断にはまず、高感度のスクリーニング検査を行う。スクリーニング検査には偽陽性があるため、陽性の場合は必ずウェスタンブロット法(WB)法とHIV-RNA量による確認検査を行う。
出典
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1: 日本エイズ学会 HIV感染症治療委員会:HIV感染症「治療の手引き」第21版、2017;p7.

HIV感染の自然経過

HIV感染後のウイルス量とCD4値の自然経過および病期との関係
出典
img
1: 日本エイズ学会HIV感染症治療委員会:HIV感染症「治療の手引き」第21版.2017;p6.