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A new study by researchers at the University of California, Davis shows that monoclonal antibodies can protect elderly diabetic rhesus monkeys from diseases caused by SARS-CoV-2 and reduce the amount of cerebrospinal fluid Signs of inflammation inside
.
The research was published in the October 18th issue of "Cell Reports"
The authors say that the data show that neutralizing antibodies can prevent the adverse inflammatory consequences of SARS-CoV-2 infection
.
The results of the study help explain how antibodies affect the course of the disease, whether they are caused by a vaccine, produced after infection, or as a treatment
Smita Iyer, associate professor of pathology, microbiology, and immunology at the University of California, Davis School of Veterinary Medicine and Center for Immunity and Infectious Diseases, and core researcher at the California National Primate Research Center, said: "COVID-19 is in the elderly and existing It’s more serious among people with the disease
.
"
"Elderly people and diabetics are often immunosuppressed, but if antibody levels are high enough, serious infections can be prevented," she said
.
The immune response caused by the vaccine is very effective in preventing serious illness and death
.
But the overwhelming inflammatory immune response may also be responsible for most of the damage in severe infections
Iyer said: "We want to know what are the immune determinants of disease
.
"
Iyer, graduate student Jamin (JW) Roh, postdoctoral scholar Anil Verma, and his colleagues studied two human monoclonal antibodies that target the SARS-CoV-2 virus spike protein in elderly diabetic rhesus monkeys
.
Between 21 and 22 years old, the age of macaques is equivalent to that of humans in their 60s
Prevent inflammation of the central nervous system
The infection of the new coronavirus in rhesus monkeys is usually mild, especially in animals pretreated with monoclonal antibodies
.
But the animals in the control group showed more signs of inflammation in their lungs
The researchers found that one week after the infection, activated immune cells (T cells) were infiltrated in the cerebrospinal fluid of the control animals
.
They did not find any viral RNA in the cerebrospinal fluid
These signs of inflammation in the central nervous system may be related to the neurological symptoms of human COVID-19 disease, or may be related to the "long-term sequelae of COVID", that is, patients experience a series of symptoms several months after infection