Lecture 3b - Cough Colds Allergy II-Black board.pptx - Cough Cold Allergy II Dr Mohammad Majed Al Ahmad Common Cold It is a self-limiting viral

Lecture 3b - Cough Colds Allergy II-Black board.pptx -...

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Dr Mohammad Majed Al Ahmad Cough, Cold, Allergy II
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Common Cold It is a self-limiting viral infection of the upper respiratory tract. Accounts for ½ of all illnesses in adults and ¾ of all illnesses in infants. Causes more time off work/school than any other illness (30% of all school absences 40% of all work absences). Season & epidemic: Peak 3 times a year : September . October . and Early spring. 50% of US residents > 1 cold yearly Adults (2 – 4 colds/year). Age < 5 yo: 12 colds/year.
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Etiology “Acute infectious rhinitis”. The main and common causative agents: Viruses: - Rhinoviruses 60% of cases - Coronaviruses, Respiratory syncytial virus (RSV), Influenza virus (types A,B,C). Double infection: bacteria and virus is rare
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Transmissi on Self-innoculation from touching mucous membranes ( nose or eye ) after contact with animate or inanimate objects with the virus. Ingestion of saliva by eating or drinking Virus survives up to 4 hours on the hand Aerosol ( Inhalation of the virus in sneezed aerosols or droplets) transmission also occurs. 75% transmitted by children . Kissing is an uncommon mode of transmission.
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Signs & Symptoms Symptoms appear in sequence: The 1 st symptom to appear in 1-2 days after contact: sore throat which resolves quickly 2 nd : nasal symptoms day 2 or 3( stuffiness ( congestion ), rhinorrhea, postnasal drip) Watering eyes, sneezing Then, cough day 4 or 5 Less common: headache, chills, pyrexia, sinus pain & myalgia Rarely associated with fever - May have a low grade especially children Symptoms persist for 7 - 14 days
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Refer to PCP Fever of > 101.5°F (38.6°C). Chest pain. SOB. Worsening or developing of new symptoms after treatment.
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  • Fall '18
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