Flu and Frailty: A Complete Guide to Protecting Older and Immunocompromised People

When the cold season arrives, flu returns with all its risks, especially for the most vulnerable groups. Older adults, immunocompromised people and those with chronic illnesses can catch the flu virus like anyone else, but they face an additional risk of developing secondary complications.

It is therefore essential to understand the danger and act preventively in order to get through the flu season as safely as possible.

Who Are Considered Frail and Why They Are at Higher Risk

Frail individuals are people with marked vulnerability. Although the causes may differ, they share a lower resistance to seasonal viruses. Below are some of the main categories.

• Older adults aged 65 and over: ageing affects the whole body, including the immune system, which becomes less efficient at fighting viruses.
• Immunocompromised people: this category includes, for example, cancer patients undergoing chemotherapy, people on immunosuppressive drugs and individuals who have undergone organ transplantation. As a group, they have weakened natural defenses.
• People with chronic illnesses: such as patients with heart disease, kidney or liver failure, or chronic respiratory diseases.

In all these at-risk categories, flu can lead to serious complications such as pneumonia, myocarditis and encephalitis, as well as worsening already compromised baseline conditions. In any case, the situation can vary greatly from one person to another.

For a complete overview of all risk categories, it is possible to consult the Italian National Institute of Health (Istituto Superiore di Sanità) website, where updated guidance documents and recommendations are available.

Personal Protection Plan: Vaccinations, Check-Ups and Medicines

Managing at-risk groups is based on an integrated approach that combines primary prevention, pharmacological support and constant medical and specialist supervision.

Among preventive measures, the seasonal flu vaccine clearly stands out. It is available every year at the beginning of the flu season. Although it does not completely eliminate the risk of infection, vaccination helps frail people avoid severe disease and can be adapted to specific types of patients.

More specifically, the vaccine formulation can vary depending on the person being vaccinated:

• Older adults: they usually do not receive a standard flu vaccine but rather an enhanced formulation, such as an adjuvanted or high-dose vaccine, to trigger a stronger immune response.
• Immunocompromised people: they are safely vaccinated with inactivated vaccines that are compatible with their pharmacological therapies (the doctor will decide the most appropriate timing). Live attenuated vaccines, on the other hand, are not suitable for this group.

In addition to the flu vaccine, frail individuals can benefit from other vaccines, including:

• Pneumococcal vaccine: protects against bacterial pneumonia, a serious complication of flu. It is recommended for older adults and people with chronic illnesses.
• COVID-19 vaccine: given the co-circulation of flu viruses and SARS-CoV-2, it is advisable for frail people to be vaccinated against both, even during the same appointment.
• RSV (Respiratory Syncytial Virus) vaccine: RSV causes a significant number of hospitalizations. The vaccine is currently recommended for older adults and individuals with pre-existing chronic diseases.

Antiviral drugs can also play an important role in the management of flu among at-risk groups. They are useful in the following situations:

• Early treatment: if used within 48 hours of symptom onset, these medicines can influence the course of the disease and reduce the risk of complications.
• Post-exposure chemoprophylaxis: in case of confirmed exposure to the virus (e.g., an outbreak in a nursing home), antivirals may be used preventively.

Managing Contacts: Safe Visits at Home and in Care Facilities

During the peaks of flu activity, and indeed throughout the whole season, it is important to adjust social interactions, limiting or reshaping occasions that may lead to infection. Below are some preventive measures that can be adopted at home and in residential care facilities.

Social Interactions at Home: Basic Measures

By its very nature, and after healthcare environments, the home is a place of protection for frail people. It is therefore crucial, when the home is also a social space, to keep infection risk outside the door. The rules are simple and intuitive.

• Self-monitoring: if you have respiratory symptoms (e.g., cough, nasal congestion), it is best to postpone visits to frail individuals and wait until all symptoms have completely disappeared for at least 24 hours.
• Hand hygiene: before entering the home of a frail person, sanitize your hands with an alcohol-based solution and then wash them thoroughly with soap and water.
• Ventilation: ensure frequent air exchange by opening windows for a few minutes several times a day, especially during visits.
• Use of masks: during epidemic peaks, wearing face masks is also advisable for home visits, particularly when a frail person is present.
• Physical distancing: at the height of flu season, it is better not to overcrowd rooms and to postpone group visits to other times of the year.
• Portable devices: the frail person may benefit from a portable air sanitizing device, such as e4life personal, which emits microwaves that neutralize viruses in bioaerosols and create a protective “cloud” around the user.

Interactions in Residential Care Facilities (Nursing Homes)

Residential care facilities are particularly prone to flu outbreaks. Here are the main points for managing the problem.

• Active surveillance: constant observation of residents, staff and visitors to identify suspicious symptoms as early as possible.
• Isolation and cohorting: residents with confirmed flu are placed in single rooms until symptoms resolve. When there are several sick residents, they are grouped together in a dedicated area, at a safe distance from everyone else.
• Reduction of group activities: in the event of an outbreak, group activities are temporarily suspended and shared moments (e.g., common dining room) are limited.
• Managing external visits: visits may sometimes be suspended or reduced. When allowed, they must follow basic hygiene rules (e.g., hand sanitization) and require the use of face masks.
• Use of antiviral medicines: in the presence of an outbreak, antivirals are administered both to ill residents (as early as possible) and to uninfected residents as needed.

Warning Signs: When to Call a Doctor or Emergency Services

When a frail person catches the flu, it is crucial to keep a close eye on related symptoms. These can worsen quickly and require medical or hospital care. The following symptoms should be reported immediately:

• shortness of breath or difficulty breathing;
• chest pain or a feeling of tightness;
• high fever that does not respond to antipyretic medicines;
• bluish discoloration of lips and face (cyanosis);
• lethargy;
• confusion or altered mental state;
• severe dizziness;
• any sudden or marked worsening of the condition.

Technological and Organizational Support for Everyday Protection

Alongside healthcare services, technological tools and social support are essential to protect at-risk groups in daily life.

Home Monitoring Technologies

There are now several very useful tools for home monitoring and management:

• Pulse oximeter: a small, portable device that measures blood oxygen saturation (SpO2). Values below 94% in a person with breathing difficulties should be reported to a doctor immediately.
• Automatic blood pressure monitor: very useful for measuring and monitoring blood pressure, especially in patients with heart disease.
• Digital or infrared thermometer: to keep track of body temperature.
• Smartphone apps: for example, apps that act as reminders for medication schedules.
• Telemedicine: to consult a doctor remotely and avoid exposing frail individuals to potentially contagious environments.

Organizational and Social Support

A social support network made up of family members, friends and professionals is an additional and important resource for helping frail people get through the flu peak.

• Planning needs: helping the person to get what they need, collecting medicines on their behalf or handling practical errands can reduce risky interactions outside the home.
• Regular contact: staying in touch through phone calls and video calls is crucial for supporting the person’s mood and for indirectly monitoring their health.
• Home care services: for more structured support, community nursing and home care services can add professional assistance to the social network.

Questions and Answers (FAQ)

Which categories are at high risk for flu complications?
High-risk groups include older adults and people with chronic illnesses, as well as cancer patients and immunocompromised individuals.

Is it useful to receive more than one vaccine (e.g., flu and COVID-19)?
Yes, co-administration of the flu and COVID-19 vaccines is a possible strategy for frail individuals. In any case, the doctor will decide according to the specific situation.

How can visits to grandparents or frail people be made safer?
It is important to follow basic hygiene rules such as washing hands with soap and water, using masks and avoiding very close physical contact with the frail person.

Which warning signs require immediate medical attention?
Symptoms that must be assessed quickly include breathing difficulties, chest pain, high fever that does not go down with antipyretics, confusion, cyanosis and severe dizziness. Any sudden worsening of the condition requires urgent medical evaluation.

Can home technologies help protect frail people?
Yes. Using pulse oximeters, digital thermometers and blood pressure monitors makes it easy and immediate to monitor frail individuals at home.