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Cris

@cristn.bsky.social

Interesses nessa rede: Covid, Política, Ciências, Direito, Mudanças Climáticas e um pouco de Humor também. RT, like e seguir não significam concordância.

112 Followers  |  271 Following  |  26 Posts  |  Joined: 11.04.2024  |  2.3528

Latest posts by cristn.bsky.social on Bluesky


Preview
The Evermaskers The isolation of people who take precautions against COVID has only gotten more intense.

"The COVID-conscious people have not abandoned science, It’s the opposite: They’ve come to think that science has abandoned them."
People who are taking precautions, some of whom are immunocompromised, should not be mocked or discriminated against
www.theatlantic.com/health/archi...

02.04.2025 14:20 — 👍 1192    🔁 344    💬 67    📌 51
Acervo da Pandemia de Covid-19 – Evidências da Política da Morte na Pandemia da Covid-19 no Brasil

Ontem na Unifesp foi lançado o Acervo da Pandemia de Covid 19 no Brasil. Um projeto imenso da SoU_Ciência, tanto em importância quanto em conteúdo.

acervopandemia-souciencia.unifesp.br

13.03.2025 13:12 — 👍 170    🔁 45    💬 0    📌 3
Fig. 5. Deep mutational scanning of the SARS-CoV-2 XBB.1.5 spike protein for the C952-C1596 antibody cocktail or CoV2-biRN5 bsAb shows potential escape mutations.
(A) The line plot shows the sum of escape for each amino acid residue in the SARS-CoV-2 XBB.1.5 S1 subunit (residues 1 to 600) as determined by a pseudovirus deep mutational scan with an equimolar cocktail of C952 and C1596 IgGs (top) or CoV2-biRN5 bsAb (bottom). Epitope residues for C952 and C1596 are highlighted with orange and purple shading, respectively. (B) BLI association and dissociation curves are shown, illustrating the effect of escape mutations in the SARS-CoV-2 XBB.1.5 S 6P on C1596 Fab binding. The concentrations of C1596 tested are indicated in each panel. The dissociation phase begins at time = 150 s and is depicted by a dotted vertical line. Fit curves are depicted as black solid lines. (C) Surface rendering of SARS-CoV-2 XBB.1.5 spike protein colored by the sum of escape scores, which is calculated as the sum of escape for all mutations at each site. Key residues of escape labeled along with their frequency across 5,240,975 sequences uploaded to GISAID CoVsurver as of 23 October 2024; frequency is denoted for the escape mutation with the greatest escape score (upper value) and for all amino acid mutations at that residue site (lower value).

Fig. 5. Deep mutational scanning of the SARS-CoV-2 XBB.1.5 spike protein for the C952-C1596 antibody cocktail or CoV2-biRN5 bsAb shows potential escape mutations. (A) The line plot shows the sum of escape for each amino acid residue in the SARS-CoV-2 XBB.1.5 S1 subunit (residues 1 to 600) as determined by a pseudovirus deep mutational scan with an equimolar cocktail of C952 and C1596 IgGs (top) or CoV2-biRN5 bsAb (bottom). Epitope residues for C952 and C1596 are highlighted with orange and purple shading, respectively. (B) BLI association and dissociation curves are shown, illustrating the effect of escape mutations in the SARS-CoV-2 XBB.1.5 S 6P on C1596 Fab binding. The concentrations of C1596 tested are indicated in each panel. The dissociation phase begins at time = 150 s and is depicted by a dotted vertical line. Fit curves are depicted as black solid lines. (C) Surface rendering of SARS-CoV-2 XBB.1.5 spike protein colored by the sum of escape scores, which is calculated as the sum of escape for all mutations at each site. Key residues of escape labeled along with their frequency across 5,240,975 sequences uploaded to GISAID CoVsurver as of 23 October 2024; frequency is denoted for the escape mutation with the greatest escape score (upper value) and for all amino acid mutations at that residue site (lower value).

Fig. 6. Bispecific CoV2-biRN5 demonstrates prophylactic efficacy in a K18-hACE2 mouse model.
(A) Shown is a schematic representation of the experimental timeline for assessing the efficacy of CoV2-biRN5 in vivo. K18-hACE2 mice received 5 mg kg−1 of either the cocktail of C952 and C1596 IgGs or the CoV2-biRN5 bsAb by intraperitoneal (ip) injection 24 hours before or 4 hours after intranasal (i.n.) inoculation with 2 × 104 PFU of the SARS-CoV-2 XBB.1.5 virus. Lungs were harvested at 3 days after infection. (B and C) Viral RNA load of SARS-CoV-2 XBB.1.5 in the lung was measured for each group (line indicates mean; n = 9 for untreated control and 5 for all other treatment groups) in the prophylaxis (B) and treatment (C) arms. Data were analyzed using one-way ANOVA, correcting for multiple comparisons with Dunnett’s test with comparison with the untreated control. ns, not significant, **P < 0.01, *P < 0.05. The dotted line indicates the lower limit of detection of the assay.

Fig. 6. Bispecific CoV2-biRN5 demonstrates prophylactic efficacy in a K18-hACE2 mouse model. (A) Shown is a schematic representation of the experimental timeline for assessing the efficacy of CoV2-biRN5 in vivo. K18-hACE2 mice received 5 mg kg−1 of either the cocktail of C952 and C1596 IgGs or the CoV2-biRN5 bsAb by intraperitoneal (ip) injection 24 hours before or 4 hours after intranasal (i.n.) inoculation with 2 × 104 PFU of the SARS-CoV-2 XBB.1.5 virus. Lungs were harvested at 3 days after infection. (B and C) Viral RNA load of SARS-CoV-2 XBB.1.5 in the lung was measured for each group (line indicates mean; n = 9 for untreated control and 5 for all other treatment groups) in the prophylaxis (B) and treatment (C) arms. Data were analyzed using one-way ANOVA, correcting for multiple comparisons with Dunnett’s test with comparison with the untreated control. ns, not significant, **P < 0.01, *P < 0.05. The dotted line indicates the lower limit of detection of the assay.

The bispecific antibody’s design was specifically created to overcome challenges presented by SARS-CoV-2’s mutations. According to researchers, the antibody C1596, which targets the NTD, binds to a quaternary epitope, a region of the virus’s spike protein that doesn’t change frequently. This antibody, when paired with C952, an antibody targeting the RBD, resulted in increased neutralization efficacy in laboratory experiments, particularly against variants that have emerged after Omicron, such as XBB.1.5.

In the study, the researchers found that the antibody pair was most effective when C1596 was placed at the N-terminal position, reinforcing the idea that the order in which the antibodies are combined matters for achieving the highest possible neutralization activity. This discovery will guide future research to further optimize bispecific antibodies for both efficacy and manufacturability.

The bispecific antibody’s design was specifically created to overcome challenges presented by SARS-CoV-2’s mutations. According to researchers, the antibody C1596, which targets the NTD, binds to a quaternary epitope, a region of the virus’s spike protein that doesn’t change frequently. This antibody, when paired with C952, an antibody targeting the RBD, resulted in increased neutralization efficacy in laboratory experiments, particularly against variants that have emerged after Omicron, such as XBB.1.5. In the study, the researchers found that the antibody pair was most effective when C1596 was placed at the N-terminal position, reinforcing the idea that the order in which the antibodies are combined matters for achieving the highest possible neutralization activity. This discovery will guide future research to further optimize bispecific antibodies for both efficacy and manufacturability.

against not just the original SARS-CoV-2 virus, but ALL variants of SARS-CoV-2 known to cause illness in humans. When tested in mouse models, the antibodies also SIGNIFICANTLY reduced the viral load in the lungs of mice exposed to Omicron variants.

09.03.2025 16:09 — 👍 844    🔁 72    💬 3    📌 0
Abstract
The ongoing emergence of severe acute respiratory syndrome coronavirus (SARS-CoV-2) variants of concern (VOCs) that reduce the effectiveness of antibody therapeutics necessitates development of next-generation antibody modalities that are resilient to viral evolution. Here, we characterized amino-terminal domain (NTD)- and receptor binding domain (RBD) -specific monoclonal antibodies previously isolated from coronavirus disease 2019 (COVID-19) convalescent donors for their activity against emergent SARS-CoV-2 VOCs.
Among these, the NTD-specific antibody C1596 displayed the greatest breadth of binding to VOCs, with cryo-electron microscopy structural analysis revealing recognition of a distinct NTD epitope outside of the site i antigenic supersite. Given C1596's favorable binding profile, we designed a series of bispecific antibodies (bsAbs), termed CoV2-biRNs, that featured both NTD and RBD specificities.
Two of the C1596-inclusive bsAbs, CoV2-biRN5 and CoV2-biRN7, retained potent in vitro neutralization activity against all Omicron variants tested, including XBB.1.5, BA.2.86, and JN.1, contrasting the diminished potency of parental antibodies delivered as monotherapies or as a cocktail. Furthermore, prophylactic delivery of CoV2-biRN5 reduced the viral load within the lungs of K18-hACE2 mice after challenge with SARS-CoV-2 XBB.1.5. In conclusion, NTD-RBD bAbs offer promising potential for the design of resilient, next-generation antibody therapeutics against SARS-CoV-2 VOCs.

Abstract The ongoing emergence of severe acute respiratory syndrome coronavirus (SARS-CoV-2) variants of concern (VOCs) that reduce the effectiveness of antibody therapeutics necessitates development of next-generation antibody modalities that are resilient to viral evolution. Here, we characterized amino-terminal domain (NTD)- and receptor binding domain (RBD) -specific monoclonal antibodies previously isolated from coronavirus disease 2019 (COVID-19) convalescent donors for their activity against emergent SARS-CoV-2 VOCs. Among these, the NTD-specific antibody C1596 displayed the greatest breadth of binding to VOCs, with cryo-electron microscopy structural analysis revealing recognition of a distinct NTD epitope outside of the site i antigenic supersite. Given C1596's favorable binding profile, we designed a series of bispecific antibodies (bsAbs), termed CoV2-biRNs, that featured both NTD and RBD specificities. Two of the C1596-inclusive bsAbs, CoV2-biRN5 and CoV2-biRN7, retained potent in vitro neutralization activity against all Omicron variants tested, including XBB.1.5, BA.2.86, and JN.1, contrasting the diminished potency of parental antibodies delivered as monotherapies or as a cocktail. Furthermore, prophylactic delivery of CoV2-biRN5 reduced the viral load within the lungs of K18-hACE2 mice after challenge with SARS-CoV-2 XBB.1.5. In conclusion, NTD-RBD bAbs offer promising potential for the design of resilient, next-generation antibody therapeutics against SARS-CoV-2 VOCs.

An illustration of the bispecific antibodies the Stanford-led research team developed to neutralize the virus that causes COVID-19. Named “CoV2-biRN,” these two antibodies work together by attaching to different areas of the virus. Credit: Christopher O. Barnes/Adonis Rubi

An illustration of the bispecific antibodies the Stanford-led research team developed to neutralize the virus that causes COVID-19. Named “CoV2-biRN,” these two antibodies work together by attaching to different areas of the virus. Credit: Christopher O. Barnes/Adonis Rubi

The bispecific antibodies target two areas of the virus: One attaches to the “NTD,” or Spike N-terminal domain, an area on the virus that does not change very much. This allows the second antibody to attach to the “RBD,” or receptor-binding domain, essentially preventing the virus from infecting human cells. Credit: Christopher O. Barnes/Adonis Rubio

The bispecific antibodies target two areas of the virus: One attaches to the “NTD,” or Spike N-terminal domain, an area on the virus that does not change very much. This allows the second antibody to attach to the “RBD,” or receptor-binding domain, essentially preventing the virus from infecting human cells. Credit: Christopher O. Barnes/Adonis Rubio

The study has been published in Science. YES, it is PEER-REVIEWED.
• www.science.org/doi/10.1126/...

09.03.2025 16:01 — 👍 2353    🔁 362    💬 19    📌 13

THIS IS HUGE! Researchers at Stanford University have developed a dual-antibody treatment that remains effective against ALL SARS-CoV-2 variants by targeting a less-mutable part of the virus. This breakthrough could lead to longer-lasting therapies that OUTPACE viral evolution. 🧪🧵⬇️

09.03.2025 16:00 — 👍 29615    🔁 7795    💬 578    📌 712
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Categorization of #LongCovid into 4 subtypes based on symptoms, with further evidence of the increased risk from multiple infections and reduced risk by vaccination and boosters.
www.thelancet.com/journals/ebi...

11.12.2024 14:39 — 👍 292    🔁 109    💬 12    📌 13
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With mild infection in healthy participants who received a SARS-CoV-2 challenge there was evidence of persistent cognitive and memory changes at least one year after Covid, compared with uninfected controls www.thelancet.com/journals/ecl...

22.09.2024 20:13 — 👍 225    🔁 97    💬 16    📌 14

🎯
A COVID longa se manifesta com desregulação das células T, inflamação e uma resposta imune adaptativa descoordenada ao SARS-CoV-2

22.09.2024 16:44 — 👍 31    🔁 18    💬 1    📌 1
Preview
Long COVID manifests with T cell dysregulation, inflammation and an uncoordinated adaptive immune response to SARS-CoV-2 - Nature Immunology Roan et al. use Olink and single‐cell RNA sequencing (scRNA-seq) to show a dysregulated crosstalk between the cellular and humoral immune responses in individuals with long COVID 8 months postinfectio...

There are plenty of studies saying that yes, it might cause immune system dysregulation. Here are some random examples:

- www.nature.com/articles/s41...
- www.nih.gov/news-events/...

I don't get why there's such a push to say "no, getting covid is fine, don't worry about it" from so many.

21.09.2024 23:01 — 👍 27    🔁 4    💬 2    📌 1
Tira de Laerte, em 4 quadrinhos.
1) Imagem de um deus de Velho Testamento, isto é: um homem, velho, de barbas longas e ar severo, por trás de nuvens e com uma auréola triangular atrás da cabeça. Um título sob a imagem indica: “DEUS”.
2) Imagem de um soldado, de capacete, segurando ameaçador um rifle. Ele está atrás de uma trincheira de sacos de areia e com arames farpados. Um título indica: “PÁTRIA”.
3) Mesa de reunião com três homens de paletó e gravata. Um deles ergue um dedo e sugere: “Que tal algo pensando no público feminino?” - outro diz, pensativo: “Hm…”
4) Imagem de uma muralha de castelo medieval, atrás da qual se alinham soldados, com lanças e capacetes. Um título indica: “FAMÍLIA”.

Tira de Laerte, em 4 quadrinhos. 1) Imagem de um deus de Velho Testamento, isto é: um homem, velho, de barbas longas e ar severo, por trás de nuvens e com uma auréola triangular atrás da cabeça. Um título sob a imagem indica: “DEUS”. 2) Imagem de um soldado, de capacete, segurando ameaçador um rifle. Ele está atrás de uma trincheira de sacos de areia e com arames farpados. Um título indica: “PÁTRIA”. 3) Mesa de reunião com três homens de paletó e gravata. Um deles ergue um dedo e sugere: “Que tal algo pensando no público feminino?” - outro diz, pensativo: “Hm…” 4) Imagem de uma muralha de castelo medieval, atrás da qual se alinham soldados, com lanças e capacetes. Um título indica: “FAMÍLIA”.

saiu na Folha @folha.com :

22.09.2024 10:34 — 👍 26618    🔁 3579    💬 173    📌 201
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Vacina atualizada contra covid19 nas versões para as variantes KP2 e JN1 Ao Excelentíssimo Sr. Luiz Inácio Lula da Silva, Presidente da RepúblicaÀ Excelentíssima Sra. Nísia Trindade Lima, Ministra da Saúde do BrasilAo Excelentíssimo Sr. Alexandre Padilha, Ministro das Rela...

Dentro desse contexto das vacinas atualizadas, há uma movimentação da sociedade civil para levar essa demanda (da urgência da aquisição e disponibilidade) de vacinas atualizadas da Covid-19 para o @minsaude.bsky.social

Vou deixar o link abaixo:

19.09.2024 14:30 — 👍 83    🔁 22    💬 4    📌 1

Seria pra usar por curto período, quando tiver q sair pros locais com muita fumaça. No restante do tempo uso a PFF2

16.09.2024 22:24 — 👍 0    🔁 0    💬 0    📌 0
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Qualidade do ar da escola 115 Norte nesse momento:

16.09.2024 10:54 — 👍 0    🔁 0    💬 0    📌 0
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Bruno, eu queria comprar uma máscara elastomérica, mas não sei escolher o filtro. Achei essas opções abaixo. Qual é a melhor pra proteger dos gases tóxicos da fumaça?

16.09.2024 10:51 — 👍 0    🔁 0    💬 1    📌 0
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E desde ontem à noite o Parque Nacional de Brasília está pegando fogo. Qualidade do ar nesse momento na Asa Norte é essa aqui:

16.09.2024 10:50 — 👍 20    🔁 2    💬 2    📌 1
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Uma nova subvariante do vírus da covid, mais contagiosa, começa a se espalhar nos EUA e Europa As vacinas da Moderna e da Pfizer disponíveis hoje nos EUA, eficientes contra as variantes KP.2 e KP.3.1.1, não protegem adequadamente contra a nova variante XEC; Brasil só tem geração mais antiga de ...

No momento a variante dominante é a KP.3. A OMS recomendou esse ano a vacinação com vacinas atualizadas mais adequadas a essas novas variantes. São as vacinas KP.2 da Pfizer e Moderna e a JN.1 da Novavax. Os EUA já começaram essa vacinação. No Brasil não temos doses suficientes nem da vacina XBB.

15.09.2024 22:18 — 👍 128    🔁 62    💬 8    📌 17

A @biaklimeck tá aqui no Bsky tb trazendo essas orientações.

16.09.2024 09:59 — 👍 0    🔁 0    💬 0    📌 0
Login • Instagram Welcome back to Instagram. Sign in to check out what your friends, family & interests have been capturing & sharing around the world.

Recomende q as pessoas evitem exposição e usem máscaras PFF2, q podem ser compradas em lojas de materiais de construção, Brunno: www.instagram.com/p/C_4ObKnv6E...

16.09.2024 09:57 — 👍 2    🔁 0    💬 1    📌 0
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Crise climática: Mundo pode não ter mais volta - 14/09/2024 - Ambiente - Folha A Terra só viu algo parecido no último período do interglacial, 120 mil anos atrás

#OPINIÃO
📝Carlos Nobre | Crise climática: Mundo pode não ter mais volta e isso me apavora. A Terra só viu algo parecido no último período do interglacial, 120 mil anos atrás.

14.09.2024 12:30 — 👍 386    🔁 103    💬 22    📌 40
Austrian woman is found guilty of fatally infecting her neighbor with COVID-19 VIENNA (AP) — A woman in Austria was found guilty of fatally infecting her neighbor with COVID-19 in 2021, her second pandemic-related conviction in a year, according to local media.

Austrian woman convicted of negligent homicide after infecting her neighbour with COVID (they died).

The woman had tested positive & told her doctor she wouldn’t isolate.

I always ask if people would change behaviour if they had to face a person they killed…is this a no? tinyurl.com/3ffnhph4

13.09.2024 20:37 — 👍 84    🔁 33    💬 4    📌 2
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Não acabou: Casos de Covid-19 têm crescimento expressivo em apenas 1 mês Número de mortos também avançou no Brasil, de acordo com dados do Ministério da Saúde; confira

Não acabou: Casos de Covid-19 têm crescimento expressivo em apenas 1 mês

Por @lucasvasques1.bsky.social

11.09.2024 19:37 — 👍 137    🔁 47    💬 11    📌 2

Contra. Quem tem criança com dificuldades de sono sofre pra fazer a adaptação e depois a readaptação.

12.09.2024 09:07 — 👍 5    🔁 0    💬 0    📌 0

O MS precisa fazer campanhas massivas explicando como a covid ainda pode ser grave, q há Covid Longa, q vacinas são seguras e efeitos adversos existem em qualquer remedinho, precisam comprar vacinas e incentivar a vacinação p/ covid-19. Não é e nunca foi uma gripezinha.

11.09.2024 21:22 — 👍 1    🔁 0    💬 0    📌 0

E se a pessoa puder comprar uma máscara mais cara, tipo uma de entrar num imóvel pegando fogo (se existir), qual filtro teria que comprar?

11.09.2024 10:05 — 👍 0    🔁 0    💬 0    📌 0
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Ex-aluna de Silvio Almeida relata ter sido assediada antes da banca de monografia | Intercept Brasil Ex-aluna afirma que Silvio Almeida, então seu professor e avaliador, a convidou para sair para não ter trabalho ‘prejudicado’. O caso, que ocorreu em 2009, só foi relatado para as amigas próximas na é...

Ex-aluna de Direito relata que seu então professor, Silvio Almeida, insistiu para sair com ela pelo telefone para não ter trabalho ‘prejudicado’. Ele era um dos membros de sua banca de monografia.

O caso, que ocorreu em 2009, só foi relatado para as amigas próximas na época. tibr.in/ex-aluna-sil...

10.09.2024 18:43 — 👍 635    🔁 108    💬 24    📌 80

Bia, CO2 os filtros com HEPA e carvão ativado conseguem filtrar? Pq a casa fechada vai acumulando CO2, né? Qual a recomendação sobre isso?

10.09.2024 21:03 — 👍 3    🔁 0    💬 0    📌 0
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É a monetização do debate político. A matéria reproduz esse comentário. Podia ser conversa de amigos discutindo voto, mas é apostador explicando a sua lógica de em quem apostar. Se o voto passa a valer dinheiro, como não considerar que a escolha de voto não vai ser influenciada por isso pra muitos?

10.09.2024 08:10 — 👍 312    🔁 53    💬 6    📌 22

O SARS-CoV-2, o vírus que causa a COVID-19,afeta os pulmões, o coração, o cérebro,os rins e os vasos sanguíneos.Ele também pode desencadear complicações como a doença de Kawasaki (KD) em crianças.
As crianças merecem ter acesso às vacinas atualizadas contra COVID

www.frontiersin.org/journals/ped...

10.09.2024 09:32 — 👍 10    🔁 3    💬 0    📌 0

Bia, sobre purificadores com HEPA e carvão ativado, eles diminuem os níveis de CO2 dentro de casa, de alguma forma? Ou teremos q abrir de tempos em tempos as janelas pra trocar o CO2 acumulado da respiração por O2, ainda q junto com fumaça mesmo?

10.09.2024 10:25 — 👍 0    🔁 0    💬 0    📌 0

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