Fourth dose, how long the virus survives on the surfaces, conjunctivitis

from Laura Della EasterLaura Della Easter

1. Is the fourth dose needed? And who has to do it?

2. How long does the virus survive on surfaces?

3. Can Covid Infection Cause Conjunctivitis?

1. Is the fourth dose needed? And who has to do it?

Does it make sense to get vaccinated for the fourth time with a vaccine calibrated on the Whuan strain? So with a vaccine that is not updated on the variants? The spread of infections raises this question also in the perspective of next autumn. Paolo Gasparinipresident of the Italian Society of Human Genetics and expert member of the Higher Health Council, is very cautious on the subject.

“Whether or not it makes sense to get vaccinated with a vaccine designed two years ago, the answer is the data. The scientific literature has clearly stated that the fourth dose is useless apart from subjects with frailty. Currently the infections are increasing, but the pressures on intensive care and hospitalization of those who have Covid are not growing, it is because they have other pathologies “, explains the expert. So much so that the Ministry of Health has provided the fourth dose only for people who have reached or exceeded 80 years, for US guests and for the frail between 60 and 79 years. The circular of the ministry specifies that “at the moment” the fourth dose “does not apply to subjects who have contracted Covid infection after the administration of the first booster dose.

lonely woman in the bus, city, empty

2. How long does the virus survive on surfaces?

The progressive loosening of restrictions and the abandonment of the obligation to wear a mask even in closed places, raises a series of questions about the possibility of contagion and how to protect ourselves. A frequent question is how long Covid can survive outside the human body, deposited on surfaces. We talk about it with Paolo Gasparinipresident of the Italian Society of Human Genetics and expert member of the Higher Health Council, clarifies this issue.

If we touch an object on which the hands of a person with the virus have placed, what chance do we have of getting infected?

The virus can survive on surfaces, from a few hours to a few tens of hours. It depends on the type of surface and the climatic conditions. If it is a metal surface exposed to a high temperature, Covid survival is low.


How long does the virus survive in the air and what are the chances of getting infected if you don’t have the protection of the mask?

Since using the face mask, we have seen a drastic drop in the incidence of the flu virus and other traditional respiratory viruses, but much less than Covid. The difference is the use of gloves. On surfaces such as those of bus seats or shopping trolleys the virus can last a long time but just do not touch your eyes or rub your mouth with your hands to protect yourself. It is not that by shaking the hand of a positive subject we are infected automatically.

So the mask protects more from the flu than from Covid?

If we compare the difference that the mask has made for the spread of flu with that for Covid, the former is superior. There hasn’t been the flu for two years. The mask certainly has its effect as a protection but it is not as effective as it was for the flu and colds.


lonely woman in the bus, city, empty

3. Can Covid Infection Cause Conjunctivitis?

This problem had already emerged when an ophthalmologist in Japan discovered Covid, as he explains Luigi Meleophthalmologist at the University Hospital of Campania, Luigi Vanvitelli and president of the Scientific Committee of the Salmoiraghi & Viganò Foundation.

What do we know about it?

There are no clinical studies on this particular effect even it has manifested itself in some cases of infected people. Rather, we have seen an important impact of the virus on assistance. Before the pandemic, we had 650,000 cataract and intravitreal operations for retinal diseases, which have been reduced by 70%. This will have major consequences for patients and public health. It is therefore necessary to make up for lost time.

How to intervene?

Those who experience this consequence as a result of infection can use antibiotic or cortisone eye drops.

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