Adverse Events Following Immunisation

Adverse Events Following Immunisation

Dr.K.Sudhakar,MD., Professor &HOD

Department of General Medicine.,GGH Guntur

Expert Committee member/Covid-19 Command Control room



                 Covishield-Viral Vector Vaccine

•The gene for a pathogen  protein is inserted into a  different virus that can  infect someone without  causing disease

•The safe virus serves as a  ‘platform’ or ‘vector’ to  deliver the protein that  triggers an immune  response

•The safe virus is then  injected as a vaccine

•Some replicate (reproduce)  in the body and some do  not

•A harmless Virus Vector transports Virus gene

•Current ex: Ebola, Zika, Dengue vaccines





ChAd0x1 nCoV-19 Corona Virus Vaccine  (Recombinant)

•Co-developed by University of Oxford & British Swedish company Astra Zenca, manufactured by Serum institute of India.

•Called as Covishield in India.

•Emergency authorisation to use given by UK, India, Argentina & Mexico.

•Scientists engineered a version of Adeno virus that infect chimpanzees to carry the gene responsible for the spike protein of the novel Corona Virus.

•Two doses /4-6 weeks apart– to get the desired effect.

•Eligibility-18years old and above

           May effect more than 1 in 10 people

Side effects

•Tenderness, pain, warmth, redness, itching, swelling or bruising at the

  Injection site.

•Generally feeling unwell

•Feeling tired (fatigue)

•Chills or feeling feverish


•Being sick (nausea)

•Joint pain or muscle ache



•Cold application at the site of injection

•Tab Paracetamol


•Touch with health provider

           May effect up to 1 in 10 people

Side effects


•A lump at the injection site




•Being  sick (nausea)


•Flu like symptoms: high fever, chills, running nose, sore throat & cough


•Cold application at the site of injection

•Tab paracetamol



           May effect up to 1 in 100 people

Side effects

•Feeling Dizzy

•Decreased Appetite

•Abdominal pain

•Enlarged lymph nodes

•Excessive sweating

•Itchy skin or Rash






•Symptomatic treatment


•Serious & unexpected side effects may occur

              Like  ANAPHYLAXIS  


•Covishield vaccine is still being studied in Clinical trials.


Very common side effect


Treatment -Minor

•Swelling & redness

Cold cloth at injection site

Paracetamo (lf pain persists)

                                                                     • For Fever >38C

                                                              Give extra oral fluids

                                                               Wear cool clothing

                                                             Tepid sponge or bath

                                                             Paracetamol 500mg SOS

Severe reactions


•Life threatening anaphylactic responses of sensitized humans occur with in minute after systemic exposure to specific antigen generally by injection.


•Vaccine induced anaphylaxis commonly due to thiomersal which is  a vaccine preservative.


•Vaccine is contraindicated in people with past history of vaccine induced reactions and any allergic reactions.

•Vaccines induces anaphylaxis 1 in 100000.

•Covishield is a Viral vector vaccine which is a safe one.


Clinical manifestations- of anaphylaxis

1. Sensation of lump in the throat, Hoarseness of voice or stridor indicates laryngeal oedema.

2. Feeling of tightness of chest and audible wheezes indicates bronchial obstruction.

3. Followed by Vascular collapse or shock sometimes

Manifestations are mild to fatal

4. Flushing with diffuse erythema and a feeling of warmth

5. Intensely pruritic urticarial rash

6. Skin angioedema

7. Angioedema-of bowel wall cause sufficient intravascular volume depletion to precipitate cardiovascular collapse.

Management –of anaphylaxis
Early recognition is mandatory since Death can occur within minutes to hours after the first symptoms

1. For mild symptoms like Pruritus & Urticaria

 Adrenaline 0.3ml to 0.5ml of 1:1000 (1mg/ml) to be given deep intramuscular or S.C


2. Repeated doses required at 5-20mts interval for a severe reaction and if needed  Adrenaline 2.5ml  diluted 1:10000 at a 5 -10mts interval by Intravenous route.


3. I.V infusion by Volume expanders : Normal Saline and Dopamine infusion for intractable hypotension.




4. Oxygen alone with cannula or with nebulized bronchodilator helpful

but severe hypoxia needs endotracheal intubation or tracheostomy.

5. Antihistamine like Diphenhydramine 50-100mg IM or IV and

Inj.Aminophyllin ,0.25-0.5g IV infusion are useful for urticaria -angioedema and bronchospasm (ancillary)


6. IV Steroids :0.5-1mg/kg of methyl prednisolone or Hydrocortisone 100mg  BiD  are not effective for acute event but may decreases the recurrence of bronchospasm, hypotension or urticaria.


Immunization error related reaction

•Errors in vaccine preparation, handling, storage or administration.

• They are preventable and detract from the overall benefit of the immunization program.

•Immunization errors can result in a cluster of events, defined as two or more cases of the same adverse event related in time, place or vaccine administered.

• These clusters are usually associated with a particular provider or health facility, or a vial of vaccine that has been inappropriately prepared or contaminated.

• Immunization errors can also affect many vials, for example, freezing vaccine during transport may result in an increase in local reactions.

Immunisation anxiety related reactions




Individuals can react in anticipation to and as a result of an injection of any kind. These reactions are not related to the vaccine, but to fear of the injection.


                            Four types are recorded


Recovery (observation)  room requirements

•Inj.Adrenaline (Epinephrine)

•Inj.Hydrocortisone or Methyl prednisolone


•Salbutamol –nebulizer

•Oxygen supply


•Normal saline/5% dextrose


•IV cannulas

•Saline sets

•Saline stands/bed with mattress


•5ml syringes

•Insulin or tuberculin syringes

•Ampoule cutter

•BP apparatus


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