Natura & ScienzePrimo Piano

Gemelli ma non proprio: concepire due volte con la superfetazione

Claudia MoschettiOttobre 9, 2021
844 3.768 1 minuto di lettura

Si può restare incinte quando si è già incinte? La domanda sembra estratta da una conversazione di mamme pancine su Yahoo Answer, ma non è tanto assurda come può sembrare.

In casi rarissimi è infatti possibile concepire di nuovo mentre è già in corso una gravidanza.

Il fenomeno, più frequente negli animali che negli umani, è chiamato superfetazione, dal latino super “in più” e fetare “fecondare”. Accade quando un ovulo viene prodotto e fecondato dopo la fecondazione di un ovulo precedente. È possibile, infatti, che durante una gravidanza si verifichi un nuovo ciclo mestruale e di conseguenza – in caso di rapporti sessuali non protetti – la formazione di un secondo embrione.

Finora, i casi registrati di superfetazione sono pochissimi, nella letteratura scientifica ne sono documentati appena dieci. 

Il primo caso accertato è del 1960. A Baltimora, i fratellini Anthony e Mark vennero erroneamente considerati gemelli prima di effettuare un esame radiografico. Si notò, infatti, che l’età ossea dei due bambini era diversa: Anthony era stato concepito due mesi prima del fratello minore. 

Uno dei casi più recenti ha il sapore della soap opera. Nel 2017, in California, Jessica Allen decise di fare da madre surrogato a una coppia cinese desiderosa di un figlio. La donna diede alla luce due bambini, uno con tratti asiatici, l’altro con tratti afroamericani. Dopo un’attenta analisi, si capì che il primo bambino era ovviamente il figlio della coppia donatrice, mentre l’altro era figlio della Allen stessa, che aveva avuto rapporti col marito durante la gravidanza surrogata.

Un evento senza precedenti, ma che pare confermare un dato da non trascurare: sembrerebbe, infatti, che la superfetazione sia più frequente in caso di inseminazione artificiale, poiché le tecniche di fecondazione assistita possono provocare una iperstimolazione ovarica che favorisce per l’appunto una maggiore produzione di ovociti.

Da tenere a mente, in caso di rapporti non protetti in una gravidanza assistita. È un fenomeno raro, è vero, ma non si sa mai!

Claudia Moschetti

Leggi anche: Tampon Tax Tour, il ciclo non è un lusso. La rivolta parte da Firenze

Tag
Claudia MoschettiOttobre 9, 2021
844 3.768 1 minuto di lettura
Foto di Claudia Moschetti

Claudia Moschetti

Claudia Moschetti (Napoli, 1991) è laureata in Filologia Moderna. Ha insegnato italiano a ragazzi stranieri e scritto per un sito universitario. È attualmente recensora presso il blog letterario Il Lettore Medio e redattrice per il magazine La Testata. Dal 2015 al 2021 ha collaborato alla fiera del libro gratuita Ricomincio dai libri, di cui è stata anche organizzatrice.
COMMENTA

844 commenti

  1. Mature adults constitute one of the most rapidly expanding demographics adopting CBD [url=https://www.cornbreadhemp.com/pages/where-to-buy-cbd-gummies-near-me ]Where to buy CBD gummies near me?[/url] products. As the body advances in years, the endocannabinoid system may grow less active, making supplementation particularly appealing. Mild formulations like capsules provide a hassle-free entry point for beginners. Speaking with a wellness professional beforehand is always a smart practice.

  9. Pet Canada Direct [url=https://petcanadadirect.shop/#]pet meds official website[/url] Pet Canada Direct

  17. dog prescriptions online [url=https://petcanadadirect.shop/#]Pet Canada Direct[/url] п»їdog medication online

  24. online drugs order [url=https://pharmrate.com/#]reputable online pharmacy no prescription[/url] buy online medicine

  32. ed prescription online [url=https://edmedscoupon.shop/#]online ed meds[/url] medicine online

  39. ed pills for sale [url=https://edmedscoupon.shop/#]Ed Meds Coupon[/url] no rx needed pharmacy

  55. antibiotics cheap [url=https://antibiotics.cheap/#]prescription antibiotic[/url] over the counter antibiotics

  64. stromectol reviews [url=https://stromectol.reviews/#]ivermectin where to buy for humans[/url] ivermectin generic cream

  71. mochi semaglutide price [url=https://semaglutide.life/#]semaglutide life[/url] how does semaglutide help you lose weight

  80. ivermectin 1 cream 45gm [url=https://stromectol.reviews/#]stromectol reviews[/url] stromectol reviews

  102. antibiotics cheap [url=https://antibiotics.cheap/#]generic antibiotics online cheap[/url] antibiotics cheap

  111. why am i so tired on semaglutide [url=https://semaglutide.life/#]rybelsus weight loss effectiveness[/url] 10mg semaglutide dosage chart

  120. over the counter antibiotics [url=https://antibiotics.cheap/#]over the counter antibiotics[/url] buy antibiotics online

  128. max dose of rybelsus [url=https://semaglutide.life/#]semaglutide life[/url] semaglutide with b12

  137. over the counter antibiotics [url=https://antibiotics.cheap/#]antibiotics cheap[/url] antibiotics cheap

  146. buy medicines online in india [url=https://indianmedsdelivery.com/#]buy medicines online in india[/url] us pharmacy no prescription

  160. Canadian Tabs [url=https://canadiantabs.com/#]reliable canadian online pharmacy[/url] Canadian Tabs

  184. online pharmacy discount code [url=https://onlinepharmfirst.com/#]Online Pharm First[/url] new pharmacy online

  200. safe online pharmacies [url=https://onlinepharmfirst.com/#]Online Pharm First[/url] online pharmacies

  208. stromectol ivermectin tablets [url=https://ivermectinfirst.com/#]ivermectin pills human[/url] ivermectin cream canada cost

  215. medicine online [url=https://onlinepharmfirst.shop/#]Online Pharm First[/url] no rx needed pharmacy

  223. pet prescriptions online [url=https://vetpharmfirst.shop/#]pet meds for dogs[/url] Vet Pharm First

  238. Vet Pharm First [url=https://vetpharmfirst.shop/#]Vet Pharm First[/url] Vet Pharm First

  244. Cheap generic Viagra [url=https://viagra.onl/#]sildenafil online[/url] viagra without prescription

  252. i got pregnant while taking semaglutide [url=https://rybelsus.pro/#]rybelsus semaglutida[/url] him and hers semaglutide

  261. cheapest cialis [url=https://cialis.sbs/#]Cialis over the counter[/url] cialis for sale

  288. Cheap Cialis [url=https://cialis.sbs/#]buy cialis pill[/url] Generic Cialis without a doctor prescription

  304. pusulabet resmi giriş [url=https://bestbetgiris.online/#]pusulabet güncel giriş[/url]

  313. Easy Canada Meds [url=http://easycanadameds.com/#]best canadian pharmacy[/url] global pharmacy canada

  319. indian pharmacy [url=https://easyindiameds.shop/#]indian pharmacy online[/url] medicine online

  322. online mexican pharmacy [url=https://easymexmeds.com/#]Easy Mex Meds[/url] farmacias mexicanas

  326. reputable canadian online pharmacies [url=https://easycanadameds.com/#]Easy Canada Meds[/url] canadian 24 hour pharmacy

  331. canadian 24 hour pharmacy [url=https://easycanadameds.shop/#]Easy Canada Meds[/url] Easy Canada Meds

  336. canadian pharmacy online ship to usa [url=https://easycanadameds.com/#]Easy Canada Meds[/url] Easy Canada Meds

  339. pet meds without vet prescription canada [url=https://easycanadameds.com/#]Easy Canada Meds[/url] Easy Canada Meds

  343. farmacia mexicana en linea [url=https://easymexmeds.shop/#]Easy Mex Meds[/url] mexican pharmacy near me

  347. buy prescription drugs from india [url=https://easyindiameds.com/#]top 10 pharmacies in india[/url] international pharmacy

  349. the purple pharmacy mexico [url=http://easymexmeds.com/#]Easy Mex Meds[/url] reputable mexican pharmacy

  357. buying prescription drugs in mexico [url=https://easymexmeds.com/#]Easy Mex Meds[/url] mexico pharmacies

  364. indian pharmacy online [url=https://easyindiameds.shop/#]online pharmacy india[/url] online pharmacy no rx

  367. Easy Canada Meds [url=http://easycanadameds.com/#]Easy Canada Meds[/url] canadian pharmacies

  373. mexico pharmacy order online [url=https://easymexmeds.shop/#]Easy Mex Meds[/url] mexico drug store online

  376. Easy Canada Meds [url=https://easycanadameds.com/#]canadian drug stores[/url] Easy Canada Meds

  383. Easy Canada Meds [url=https://easycanadameds.shop/#]Easy Canada Meds[/url] canadian drug prices

  385. mexican pharmacies that ship to the united states [url=https://easymexmeds.shop/#]Easy Mex Meds[/url] farmacia pharmacy mexico purchase online

  389. Easy Canada Meds [url=http://easycanadameds.com/#]Easy Canada Meds[/url] canadianpharmacy com

  399. india online pharmacy [url=https://easyindiameds.com/#]reputable indian pharmacies[/url] legal online pharmacies in the us

  402. indian pharmacy paypal [url=https://easyindiameds.com/#]Easy India Meds[/url] п»їinternational drug mart

  446. Generic Tadalafil 20mg price [url=http://cialisvip.com/#]Cialis Vip[/url] Generic Cialis without a doctor prescription

  468. Viagra Tablet price [url=https://sildenafilvip.com/#]Sildenafil Vip[/url] Cheap Sildenafil 100mg

  483. Cialis over the counter [url=http://cialisvip.com/#]Cialis Vip[/url] Generic Tadalafil 20mg price

  490. п»їcialis generic [url=https://cialisvip.online/#]Buy Tadalafil 5mg[/url] buy cialis pill

  496. ivermectin where to buy for humans [url=http://stromectolvip.com/#]buy ivermectin[/url] cost of ivermectin cream

  504. online pharmacy no prescription needed [url=https://victopharm.com/#]Victo Pharm[/url] reliable online pharmacy

  526. shop medicine online [url=https://victopharm.shop/#]Victo Pharm[/url] best mail order pharmacy

  534. viagra canada [url=https://urohealthdaily.shop/#]Viagra Tablet price[/url] Order Viagra 50 mg online

  541. Viagra online price [url=http://urohealthdaily.com/#]UroHealth Daily[/url] over the counter sildenafil

  550. Cheap generic Viagra [url=https://urohealthdaily.shop/#]sildenafil over the counter[/url] viagra canada

  558. Buy Tadalafil 5mg [url=http://mensrxguide.org/#]Buy Tadalafil 10mg[/url] Generic Cialis without a doctor prescription

  563. Generic Cialis without a doctor prescription [url=https://mensrxguide.org/#]Buy Tadalafil 10mg[/url] Cheap Cialis

  666. yellow capsule identification g 2705 gabapentin [url=https://neurontinnnprc.com/verified-pharmacy-directory/#]Gabapentin[/url] what are some nursing considerations for gabapentin

  672. can we buy amoxcillin 500mg on ebay without prescription [url=https://amoxilidari.com/sourcing-and-telemedicine/#]Amoxil[/url] buy cheap amoxicillin online

  680. amoxicillin 875 125 mg tab [url=https://amoxilidari.com/sourcing-and-telemedicine/#]Infectious Disease & Antimicrobial Research Institute[/url] amoxicillin 500mg capsules price

  687. ivermectin syrup [url=https://ivermectiniaar.com/generic-ivermectin-efficacy/#]Clinical Pharmacology and Safety Profiles of Stromectol[/url] how much is ivermectin

  694. purple pharmacy online [url=https://mexicaredirect.com/#]MexiCare Direct[/url] mexican pharmacies that ship to us

  700. mexican drug store [url=https://mexicaredirect.com/#]MexiCare Direct[/url] my mexican pharmacy

  706. top online pharmacy india [url=https://fleximedsindia.shop/#]pharmacy website india[/url] medicine online

  714. MexiCare Direct [url=https://mexicaredirect.com/#]mexican pharmacy near me[/url] mexi pharmacy

  741. legit canadian online pharmacy [url=http://easynorthrxs.com/#]Easy North RX[/url] Easy North RX

  748. indian pharmacy online [url=https://fleximedsindia.com/#]Flexi Meds India[/url] express scripts mail order pharmacy

  755. mexican pharmacy online [url=https://mexicaredirect.shop/#]phentermine in mexico pharmacy[/url] farmacia mexicana online

  763. top 10 pharmacies in india [url=https://fleximedsindia.shop/#]Flexi Meds India[/url] reliable online pharmacy

  770. top 10 online pharmacy in india [url=https://fleximedsindia.shop/#]Flexi Meds India[/url] reputable online pharmacy no prescription

  777. MexiCare Direct [url=http://mexicaredirect.com/#]can i buy meds from mexico online[/url] MexiCare Direct

  783. order meds from mexico [url=https://mexicaredirect.com/#]MexiCare Direct[/url] MexiCare Direct

  789. MexiCare Direct [url=http://mexicaredirect.com/#]purple pharmacy mexico[/url] pharmacy mexico city

  795. online canadian pharmacy reviews [url=https://easynorthrxs.shop/#]Easy North RX[/url] Easy North RX

  800. reputable indian online pharmacy [url=http://fleximedsindia.com/#]buy medicines online in india[/url] overseas online pharmacy

  806. Easy North RX [url=https://easynorthrxs.com/#]Easy North RX[/url] canadian pharmacy world reviews

  818. hydrocodone mexico pharmacy [url=http://mexicaredirect.com/#]MexiCare Direct[/url] MexiCare Direct

  825. DailyBalancePharmacy [url=http://dailybalancepharmacy.com/#]rybelsus 7 mg vs 14 mg weight loss[/url] DailyBalancePharmacy

  832. gabapentin daily therapy [url=https://neuropathpharmacys.com/#]gabapentin daily therapy[/url] gabapentin daily therapy

  839. rybelsus oral medication guide [url=https://dailybalancepharmacy.shop/#]semaglutide compounding pharmacy[/url] semaglutide peptide

Lascia un commento

Il tuo indirizzo email non sarà pubblicato. I campi obbligatori sono contrassegnati *

Pulsante per tornare all'inizio
Powered by  GDPR Cookie Compliance
Panoramica privacy

Questa Applicazione utilizza Strumenti di Tracciamento per consentire semplici interazioni e attivare funzionalità che permettono agli Utenti di accedere a determinate risorse del Servizio e semplificano la comunicazione con il Titolare del sito Web.