You linked three articles citing one study which says "Fully vaccinated individuals with delta variant infection had a faster (posterior probability >0·84) mean rate of viral load decline (0·95 log10 copies per mL per day) than did unvaccinated individuals with pre-alpha (0·69), alpha (0·82), or delta (0·79) variant infections". and "The analysis also found that 25% of vaccinated household contacts still contracted the disease from an index case, while 38% of those who hadn’t had shots became infected."
This means that no, vaccinated people are not equally susceptible of getting the virus.
There are also two issues with the study; "The proportion of asymptomatic cases did not differ among fully vaccinated, partially vaccinated, and unvaccinated delta groups", and "However, given that index cases were identified through routine symptomatic surveillance, there might have been a selection bias towards identifying untypically symptomatic vaccine breakthrough index cases." This means that the study is not conclusive and more needs to be done to capture a real population. Medical science doesn't work by simply having one or two studies on a subject, make a conclusion, then move on. There needs to be many reproducible results of varying types of studies to build a body of evidence.
Now, if your interpretation was correct that vaccines have no effect on the spread of the virus, then it would further reinforce the need to be vaccinated since it would seem inevitable that everyone will be infected, therefore the only protection from death or severe symptoms is being vaccinated.
You linked three articles citing one study which says "Fully vaccinated individuals with delta variant infection had a faster (posterior probability >0·84) mean rate of viral load decline (0·95 log10 copies per mL per day) than did unvaccinated individuals with pre-alpha (0·69), alpha (0·82), or delta (0·79) variant infections". and "The analysis also found that 25% of vaccinated household contacts still contracted the disease from an index case, while 38% of those who hadn’t had shots became infected."
This means that no, vaccinated people are not equally susceptible of getting the virus.
There are also two issues with the study; "The proportion of asymptomatic cases did not differ among fully vaccinated, partially vaccinated, and unvaccinated delta groups", and "However, given that index cases were identified through routine symptomatic surveillance, there might have been a selection bias towards identifying untypically symptomatic vaccine breakthrough index cases." This means that the study is not conclusive and more needs to be done to capture a real population. Medical science doesn't work by simply having one or two studies on a subject, make a conclusion, then move on. There needs to be many reproducible results of varying types of studies to build a body of evidence.
Now, if your interpretation was correct that vaccines have no effect on the spread of the virus, then it would further reinforce the need to be vaccinated since it would seem inevitable that everyone will be infected, therefore the only protection from death or severe symptoms is being vaccinated.
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