Media caption, Covid: Australia's Flying Doctors take vaccines to vast remote areas Get a longer daily news briefing from the BBC in your inbox, each weekday morning, by signing up here. And there's more Scientists are keeping a close eye on a new mutation of the Delta variant, but what it is?

We've taken a look. Find further information, advice and guides on our coronavirus page. Image source, BBC What questions do you have about coronavirus? In some cases, your question will be published, displaying your name, age and location as you provide it, unless you state otherwise.

Your contact details will never be published. Use this form to ask your question: If you are reading this page and can't see the form you will need to visit the mobile version of the BBC website to submit your question or send them via email to YourQuestions bbc. According to the Brazilian Ministry of Health, more than 2, people were infected by the end of July. The second wave There is no uniform international standard for how a second what caused the second wave of covid 19 is defined. Even the WHO has no clear guidelines. WHO spokesman Christian Lindmeier wrote in an email to DW: "The term refers [only] to new outbreaks that have occurred after an initial decline. The same applies to a 'third' wave. Scientists are comparing the coronavirus with the Spanish fluwhich raged from to According to the WHO, it claimed between 20 and 50 million lives worldwide. The Spanish https://nda.or.ug/wp-content/review/travel-local/facebook-device-samsung-smart-tv.php of killed millions of people That pandemic ran in three waves.

The second wave was much worse than the first and caused many more deaths.

Between the individual phases, the virus mutated. That could also be the case with the novel coronavirus. What if the virus mutates? Every virus can mutate, i. At best, a virus becomes weaker through mutation. This means that it is less dangerous and claims what caused the second wave of covid 19 victims. For this to happen, however, a large number of people must already have developed immunity to a virus. People develop immunity against most viruses. When infected, the body produces antibodies and, if these succeed in fighting off the virus, a person becomes immune. The virus can then no longer harm that person. But it is unclear whether this is also completely true of the novel coronavirus.

More and more cases indicate that https://nda.or.ug/wp-content/review/sports/where-are-food-trucks-located.php COVID sufferers no longer have any detectable antibodies in them after just a few months. This could mean that they could become infected again. With a serological testexperts can determine whether someone has produced antibodies against the virus. But such a test does not provide any information about whether the person is then immune to the virus and, if so, for how long. Scientists are now trying to answer these questions. During times when the coronavirus pandemic has been at its most severe, there were often voices suggesting that only so-called herd immunity could contain the disease. Herd immunity occurs when a high percentage of the population is already immune so the pathogen can no longer spread as quickly. Medical journal The Lancet recently published a study on herd immunity indicating that herd immunity against the coronavirus will be "difficult to achieve.

The virus likes it cold Viruses feel comfortable in cold environments. This is a reason, for example, why several coronavirus outbreaks have been in slaughterhouses, where temperatures are usually quite low. By contrast, viruses generally do not spread as quickly in hot weather as in cold.

At warmer times of year, there should thus be fewer infections with viruses. In addition, if it is cold outdoors, people spend more time indoors, where there is much less exchange of air than outside. This means that virus-laden aerosols — tiny airborne droplets — can spread more easily. At the beginning of the pandemic, experts assumed that SARS-CoV-2 was spread by means of larger droplets, such as those produced by coughing and talking, and by smear infection, i. But we soon learned better: The virus can also linger in the air in the form of aerosols and be transmitted what caused the second wave of covid 19 this way.

If it is dry and cold outside, these are ideal conditions for the virus. The aerosols then remain in the air much longer than on warm days. But precautions are always necessary — and winter has not yet even begun in the northern hemisphere. Early risers in Venice woke up on June 3, to the sight of a cruise ship sailing down the Giudecca Canal for the first time since the start of the coronavirus pandemic, despite the Italian governments' promises to reroute the huge ships due to safety and environmental concerns.

The strongest self-quarantine instructions have been issued to those in high-risk groups. Chan School of Public Health recommends a healthy diet, being physically active, managing psychological stress, and getting enough sleep. The review concluded that a minimum day quarantine may be beneficial in preventing the spread of COVID and may be more effective if combined with an additional control measure like border screening.

In these, supportive care includes medication such as paracetamol or NSAIDs to relieve symptoms fever, body aches, coughproper intake of fluids, rest, and nasal breathing. Centers for Disease Control and Prevention CDC recommend that those who suspect they are carrying the virus visit web page themselves at home and wear a face mask.

In those with low oxygen levels, use of the glucocorticoid dexamethasone is strongly recommended, as it can reduce the risk of death. The disease may take a mild course with few or no symptoms, resembling other common upper respiratory diseases such as the common cold. Among those who have died, the time from symptom onset to death has ranged from two to eight weeks. However, people transferred to an ICU had a median time of ten days between hospitalisation and death. Partial lockdowns to battle a difficult second wave Both Spain and Australia claimed early success against the virus, although they took very different approaches. Canberra decided to effectively seal the country off from the rest of the world, while Spain courted summer visitors to salvage some of the vital tourism season. Both have seen regional spikes, and have responded with targeted lockdowns, which depend, however, on a what caused the second wave of covid 19 and trace capacity that lets authorities see where and how the virus is spreading.

The region around the Spanish capital is bracing for a return of controls, although the government is trying to avoid calling them lockdowns. Restrictions will apply to areas with more than 1, cases perpeople.

They will affect nearly a million people and will effectively limit movement to work, medical and educational reasons. Targeted regional lockdowns depend, however, on a track and trace capacity that lets authorities see where and how the virus is spreading.

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