Custom Search

       

 

Infectious Disease Online

Cutaneous Infections and Infestations:

Bacterial, Rickettsial and Chlamydial Infections

Dr Sampurna Roy MD                       

 

Bacteria form part of the normal resident flora of the skin.

In certain conditions these are of pathogenic importance.

Visit: Cutaneous Infections and Infestations

Superficial pyogenic infection (pyodermas): These are usually caused by staphylococcus aureus and strains of Streptococcus. These are usually characterized by a dense acute inflammatory infiltrate. Hair follicles may also be infected causing folliculitis.

Staphylococcal Infection

Impetigo

Staphylococcal scalded skin syndrome

Toxic Shock Syndrome

Streptococcal Infection

 

Cornybacterial Infections:

Biopsy may appear normal.

The lesion is usually limited to the stratum corneum.

Diphtheria

Erythrasma: Locatd in skin folds.

This is an example of "invisible dermatosis".

Caused by diptheroid bacilli, Cornybacterium minutissimum. Special stain : Small coccobacilli are demonstrated by Gram , PAS and methenamine silver preparations.

Pitted keratolysis : Often located on the plantar  surface of the feet. Pits appear as multiple crateriform defect in the stratum corneum.

Filamentous and coccoid organisms are demonstrated by Gram and methenamine silver stain.

 

Chlamydial Infection 

Psittacosis

Lymphogranuloma Venereum

 

                                                    

Deep pyogenic Infection (Cellulitis): Cellulitis is a diffuse inflammation of the connective tissue of the skin and deeper soft tissue.

Erysipelas: Form of cellulitis. Subepidermal edema with formation of vesiculobullous lesion. There may be a dense diffuse neutrophilic infiltrate and in some cases vascular and lymphatic dilatation.

Necrotizing fasciitis: (Flesh eating bacteria).

Rare form of cellulitis, usually located on the leg.It progresses to necrosis of skin and underlying tissues and may spread into the underlying muscle. Histologicallly there is necrosis of the epidermis, dermis and upper subcutis. There is septic vasculitis with inflammation of the vessel wall. Thrombi may be present in the lumen.

Clostridial myonecrosis (Gas gangrene)

Blastomycosis-like pyoderma

 

 

Rickettsial Infection:

Usually produces acute febrile illness together with headache and myalgia.

Histologically, there is lymphocytic vasculitis and areas of coagulative necrosis of the epidermis and dermis.

Rocky Mountain Spotted Fever

Epidemic Typhus

Scrub Typhus

 

 


 

 

 

 


 

 

Histopathology-India.net

 

Pathopedia-India.com

 

Surgical Pathology.com

 

Pathology-India.com

 

Dermpath-India

 

Infectious Disease Online

 

Pathology Quiz Online 

 

Paediatric Pathology Online

 

Pancreatic Pathology Online

 

Paraganglioma-Online

 

Endocrine Pathology Online

 

Eye Pathology Online

 

Ear Pathology Online

 

Cardiac Path Online

 

Pulmonary Pathology Online

 

Lung Tumour Online

 

Mesothelioma-Online

 

Nutritional Pathology Online

 

Environmental Pathology Online

 

Soft Tissue Tumour Online

 

GI Path Online-India

 

Gallbladder Pathology Online

 

E-book - History of Medicine  

 

Microscope - Seeing the Unseen

 

 

 

Disclaimer

Privacy Policy  

Advertising Policy

Copyright 2017  histopathology-india.net