Everything You Wanted to Know About Influenza and the Flu Vaccine

Flu symptoms include fever, muscle aches, runny nose, cough, sore throat, headache, and fatigue, which usually last from a week to ten days. The best way to protect the whole family from flu and its complications is to make sure everyone gets vaccinated before the winter season reaches its peak.

What are the symptoms of the flu?

The main symptoms of flu include a sudden fever above 38°C, runny or congested nose, muscle aches, headache, sore throat, and/or general fatigue. Symptoms appear about two days after infection. At first, they worsen, and then gradually improve. The illness usually lasts about a week.

In some cases, flu can lead to serious complications. These may include bacterial pneumonia secondary to the viral infection, or respiratory failure. Such complications can be very severe and may even lead to death. Certain populations are at higher risk of complications: the elderly, infants, people with chronic lung disease, and those with suppressed immune systems.

How is flu transmitted?

The flu virus spreads through direct contact with droplets released by an infected person when coughing or sneezing. These droplets reach a healthy person’s airways either by inhaling contaminated air or by touching contaminated objects (such as eating utensils, door handles, elevator buttons, etc.) and then touching the face.

Flu patients are contagious from about a day before symptoms appear and for about 5–6 days afterward. People with weakened immune systems may be contagious for longer.

What is the treatment for flu? Do you need antibiotics?

The usual treatment for flu is aimed at easing symptoms and strengthening the body. It includes rest, drinking fluids, fever-reducing medication, nasal drops, and so on. Since the flu is caused by a virus and not bacteria, antibiotics are not needed.

Flu Vaccination at Leumit Medical Centers

All Leumit clients aged 6 months and older are invited to receive the flu vaccine.

To avoid unnecessary exposure and for your health and safety, do not come to the medical center without an appointment. You can schedule an appointment for vaccination via the Leumit website, the app, or the customer service center at *507. For your convenience, upon entering the website or app you can choose the vaccination site most accessible to you, along with your preferred date and time.

The list of Leumit vaccination sites and medical centers where the flu vaccine is available is updated regularly.

Please note: you must remain at the medical center for 15 minutes after receiving the vaccine.

If you have COVID-19 or symptoms such as fever and cough, do not come to the medical center.

Book an appt.

The Flu Vaccine

The flu vaccine contains either an inactivated (killed) flu virus or a weakened live flu virus. These cannot cause flu. The vaccine has been used for many years and prevents both infection and complications such as pneumonia, hospitalization, and death.

Inactivated Flu Vaccine

This year, the vaccines available are Influvac-Tetra, Vaxigrip-Tetra, or Fluzone (for age 65+).

They are suitable for anyone aged 6 months and older.

After vaccination, the body’s immune system starts producing antibodies, which play a key role in protecting against future flu infections.

You can get vaccinated if you have a mild illness without fever, or a fever under 38°C; after recovering from a severe illness; after exposure to an infectious disease; while on antibiotics; or while being treated with steroids.

Do not get vaccinated if:

  • You had a severe allergic reaction in the past to the flu vaccine.
  • You have a life-threatening allergy to a component of the vaccine (excluding egg protein).
  • You currently have a severe illness with fever.
  • You developed Guillain-Barré Syndrome within six weeks of a past flu vaccination.

Do Inactivated Flu Vaccines Have Side Effects?

Generally, side effects are rare.

The vaccine contains inactivated viruses and cannot cause flu. If a respiratory infection develops soon after vaccination, it likely means the vaccine was given during the incubation period of the flu (after exposure), so the illness would have appeared regardless, or it was caused by another pathogen.

Local side effects may include redness, swelling, and tenderness at the injection site lasting 1–2 days, occurring in less than one-third of recipients.

Other possible effects include fever, muscle aches, and a general feeling of illness lasting 1–2 days. These are rare and mostly occur after the first vaccination. Even then, they are much milder than actual flu symptoms.

FluMist (Live Attenuated Intranasal Vaccine)

From age 2 to 49, you can get the live attenuated flu vaccine as a nasal spray. The spray is administered into both nostrils. The weakened viruses replicate only in the nasal passages, and the body’s immune system develops antibodies against them.

Live attenuated vaccines are created by weakening the disease-causing agent so it can still replicate slightly and trigger an immune response. The immune system produces a broad response, focusing on the site where protection is needed.

The vaccine is safe and recommended. If side effects occur, they are usually mild and may include: runny nose, cough, fever, muscle aches, stomach pain, diarrhea, or vomiting.

In very rare cases (1 in 1,000,000), a severe allergic reaction may occur immediately after vaccination. You must remain near the clinic for about 15 minutes after vaccination.

Do not use the live attenuated nasal spray vaccine in the following cases:

  • Severe allergic reaction after a previous flu vaccine.
  • Known allergy to a vaccine component.
  • Pregnancy.
  • Immune system impairment due to illness or immunosuppressive treatment, including congenital or acquired immune suppression, drug therapy, or anatomical/functional asplenia.
  • Children with underlying conditions such as heart and vascular disease (except blood pressure disorders), kidney or liver disease, neurological, hematological, or metabolic diseases (including diabetes), chronic lung disease, or children receiving oral steroid treatment for asthma (not inhalers).
  • Children who have been wheezing within the last 72 hours.
  • Children treated with aspirin (due to risk of Reye’s Syndrome).
  • During a severe illness — consult a doctor before vaccination. Vaccination is permitted during mild illness.
  • If the child has had Guillain-Barré Syndrome less than 6 weeks after a flu vaccine in the past.
  • If receiving antiviral flu treatment — wait at least 48 hours after completing treatment before vaccination.
  • If significant nasal congestion is present, which may prevent the vaccine from reaching the nasal lining — vaccination may need to be postponed.

Do Live Attenuated Flu Vaccines Have Side Effects?

In children, side effects are usually mild and may include: runny nose, cough, fever, muscle aches, stomach pain, diarrhea, or vomiting.

In very rare cases (1 in 1,000,000), a severe allergic reaction may occur immediately after vaccination. You must remain near the clinic for about 15 minutes after vaccination.

A sick girl with a cold

How Can You Protect Yourself from the Flu?

  • Wash your hands thoroughly and frequently, especially before eating and after using the toilet.
  • Avoid touching your face, especially mouth, nose, and eyes.
  • Cough and sneeze into your elbow.
  • Ventilate rooms at home and at work.
  • Keep distance (social distancing), especially from sick people.
  • Dispose of used tissues immediately and wash your hands afterward.
  • Avoid crowds and crowded places.
  • If sick, stay home until 48 hours after symptoms end. Do not send sick children to school or go to work while ill.
  • Get vaccinated against flu as soon as you are notified of your eligibility.

We thought you'd find this interesting